Warning & Error Codes - YMGI HVAC Supply

Protection & Error Codes

To determine which Error codes apply to your system, look at the serial number of your Outdoor Unit. The prefix will tell you which M series Error Codes are correct for your unit

Example:
Serial #: M3-XXXXXX-WMMS-XXXXXXX(XX)-XXXXXXXXX
Use M3 Error Codes to diagnose

M6 (56)(57)(58)(59)Error Codes
M3 Error Codes
M2 Error Codes
(78) Series Error Codes
M1 13 SEER Error Codes
M1 (57) 16 SEER Error Codes
M1 (48) Series Error Codes
M1 (46) Series Error Codes
VRF System Error Codes
PTAC Systems Error Codes

M6 (56),(57),(58),(59) Systems

M6 Single & Multi Zone (56),(57),(58),(59)

Error Code	Description	Indoor Unit LED Display
C1	Current arc protection	Running LED-Off 3S, Blinks 12 times
C2	Current leakage protection	Running LED-Off 3S, Blinks 13 times
C3	Mis-wiring protection	Running LED-Off 3S, Blinks 14 times
C5	Jumper error protection	Running LED-Off 3S, Blinks 15 times
C6	No-ground	Running LED-Off 3S, Blinks 16 times
Cd	Too much CO2 protection	TBD
CF	Current short-out protection	TBD (Buzzer will sound once every 2 sec.)
d1	WSHP: UV light error	TBD
E0	Commercial: Water pump overload/error/flow switch error	Running LED-Off 3S, Blinks 10 times
E1	System high pressure protection	Running LED-Off 3S, Blinks 1 time
E2	Anti-freezing protection (heat exchanger-ID, OD)	Running LED-Off 3S, Blinks 2 times
E3	Low pressure protection (run cooling when OD is too cold)	Running LED-Off 3S, Blinks 3 times
E4	Compressor dischage pressure too high	Running LED-Off 3S, Blinks 4 times
E5	System/compressor current too high	Running LED-Off 3S, Blinks 5 times
E6	Communication error (ID-OD)	Running LED-Off 3S, Blinks 6 times
E7	Mode clash (some Indoor Units set to run cooling/fan, some set to run heating)	Running LED-Off 3S, Blinks 7 times
E9	Indoor Unit Water Full Error	Cooling LED Flashing/Heating LED Flashing (both flashing)
EA	VRF: Oil valve protection	TBD
Ec	Commercial & VRF: Water flow protection (lack of water flow)	TBD
Ed	System temperature too high	TBD
EE	Memory chip error (U5)	Heating LCD-Off 3S, Blinks 15 times
EF	Outdoor fan motor overload	TBD
EL	Fire alarm	TBD
EP	Shell top high temperature protection	TBD
F0	System refrigerant lack or restriction protection	Cooling LED-Off 3S, Blinks 10 times
F3	Outdoor abmient temperature sensor error	Cooling LED-Off 3S, Blinks 3 times
F8	Incoming water temperature sensor error	Cooling LED-Off 3S, Blinks 8 times
F9	Outgoing water temperature sensor error	Cooling LED-Off 3S, Blinks 9 times
FA	Oil temperature sensor error	TBD
Fd	Suction gas temperature sensor error	TBD
FE	User side water sensor error	TBD
FL	Water tank-middle sensor error	TBD
FP	CO2 checking error	TBD
FU	Shell top temperature sensor error protection	TBD
H1	Heating-Defrosting, or oil return	TBD
H2	Static electric de-dust protection	Heating LED-Off 3S, Blinks 2 times
H3	Compressor over-temperature protection	Heating LED-Off 3S, Blinks 3 times
H4	System abnormal (many different other reasons…)	Heating LED-Off 3S, Blinks 4 times
H5	IPM abnormal / Control Module Protection IPM Module protection, could be caused by over-charged refrigerant/high pressure (bad manifold gauge), restricted refrigerant flow or kinks on refrigerant pipes.	Heating LED-Off 3S, Blinks 5 times
H6	Indoor fan motor-no feedback.	Running LED-Off 3S, Blinks 11 times
H7	Compressor loses steps, not being able to check rotor position	Heating LED-Off 3S, Blinks 7 times
HC	PFC board abnormal / PFC protection	Heating LED-Off 3S, Blinks 6 times
HE	Compressor de-managet protection (rotor locked /doesn't rotate)	Heating LED-Off 3S, Blinks 14 times
L0	Airflow switch error	TBD
L1	Humidity sensor error	TBD
L2	Water level switch error / hot water tank level switch error	TBD
L3	Outdoor DC motor error (L3 for dual -mtor 1, LA for motor 2)	Running LED-Off 3S, Blinks 23 times
L4	Filter clogged	TBD
L5	Circulating water temperature sensor error	TBD
L6	System capacity insufficient	TBD
L7	Water pressure switch protection	TBD
Lc	Starting failure	Heating LED-Off 3S, Blinks 11 times
Ld	Power phase loss/lack	TBD
LE	Compressor locked	Running LED-Off 3S, Blinks 22 times
LF	Compressor over-speed protection	TBD
LH	Indoor ambient temperature too high	TBD
LL	Indoor ambient temperature too low	TBD
LP	Indoor-Outdoor units don't match or power line connection error	Running LED-Off 3S, Blinks 19 times
P0	Driving module resumed	TBD
P5	Driving board checking-compressor current too high	Heating LED-Off 3S, Blinks 15 times
P6	Driving board checking-communication error with indoor board	Heating LED-Off 3S, Blinks 16 times
P7	Radiator loose, or IPM /PFC board sensor abnormal /error	Heating LED-Off 3S, Blinks 18 times
P8	Radiator loose, or IPM /PFC board too hot	Heating LED-Off 3S, Blinks 19 times
P9	AC contactor protection	TBD
PA	AC current protection (incoming)	TBD
Pc	Current checking-circuit error or current sensor error	TBD
Pd	Current checking-connection error (U-V-W not connected accordingly)	TBD
PE	Temperature sensor drifting protection	TBD
PF	Driving board-ambient temperature sensor error	TBD
PH	DC incoming voltage too high (program checking)	Cooling LED-Off 3S, Blinks 11 times
PL	DC incoming voltage too low (program checking)	Cooling LED-Off 3S, Blinks 21 times
PP	AC incoming power abnormal (too low or too high)	TBD
PU	Capacitor-charging circuit error	Heating LED-Off 3S, Blinks 17 times
U7	4-way switch valve abnormal	Heating LED-Off 3S, Blinks 20 times
U6	Oil temperature too high	Heating LED-Off 3S, Blinks 16 times
U4	Compressor rotation reversed	Heating LED-Off 3S, Blinks 14 times
U5	Rectifying current checking error	Heating LED-Off 3S, Blinks 13 times
U3	DC main bus voltage drop	Heating LED-Off 3S, Blinks 20 times
U1	Compressor phase current checking circuit error	Heating LED-Off 3S, Blinks 13 times
U2	Compressor phase loss protection	Heating LED-Off 3S, Blinks 12 times
UC	Filter needs to be cleaned	TBD
U8	PG motor (indoor) checking circuit error	Running LED-Off 3S, Blinks 17 times
U9	Outdoor fan motor checking circuit error	Running LED-Off 3S, Blinks 18 times
UF	De-actuate remote or control, from a long distance	TBD
C7	PTC heater sensor error	Heating LED-Off 3S, Blinks 9 times
FJ	Discharge/vent air temperature sensor error	TBD
L8	Storage tank water level switch error	TBD
d3	AC condensate: anti-freezing sensor error	TBD
d4	Domestic water: anti-freezing sensor error	TBD
d5	Return water sensor error	TBD
d6	Defrost coil sensor error	TBD
d7	Back-up hot water temperature sensor error	TBD
d8	Hot water outlet temperature sensor error	TBD
d9	Hot water inlet temperature sensor error	TBD
db	Temp. Sensor Error-after metering device (cap. Tube, or EXV)	TBD
dc	Temp. Sensor Error-suction tube	TBD
dP	Temp. Sensor Error-discharge tube	TBD
dL	Low voltage reluctance/reluctor error	TBD
L9	Compressor Protection-calculated input is too high	Running LED-Off 3S, Blinks 20 times
dF	Temp. Sensor Error-solar water heater-water outlet	TBD
dH	Temp. Sensor Error-solar water heater-assistant ele. heater	TBD
dU	Door-lock sensor: card is not in	TBD
dJ	AC phase protection (lost or reversed)	TBD
d0	Fan motor speed communication error	TBD
Eo	Special function board error	TBD
dn	Mulitiple zone-pipe connection doesn't match with comm. wire connection	TBD
Cn	Not for AC: Buring gas density too high	Cooling LED-Off 3S, Blinks 23 times
Fn	Not for AC: Buring gas sensor error	Running LED-Off 3S, Blinks 21 times
HP	Solar AC: solar power input voltage is higher than 180V	TBD
dA	AHU or RT: discharge air-relative humidity sensor error	TBD
dE	AHU or RT: fresh air-relative humidity sensor error	TBD
Fr	AHU or RT: fresh air-temp. sensor error	TBD
UA	DC inverter driving error 1	TBD
dr	AHU or RT: air flow pressure sensor error	TBD
Ub	DC inverter driving error 2	TBD
Ud	DC inverter driving error 3	TBD
UE	DC inverter driving error 4	TBD
LU	Compressor power input limit / decrease HZ (system power input)	Cooling LED-Off 3S, Blinks 24 times
LA	Outdoor unit fan motor protection (not rotating, or not connected). If 2 motors, motor 1-L3, motor 2-LA	Running LED-Off 3S, Blinks 24 times
A5	Condensing coil-inlet temp. sensor error (=F5 in commercial units)	TBD
A7	Condensing coil-outlet temp. sensor error (=F7 in commercial units)	TBD
e4	Compressor dischage temp. (=pressure) too high	TBD
e8	Over-load protection (outdoor coil temp. too high)	TBD
e1	Dicharge pressure sensor error	TBD
ee	DC inverter driving chip error	TBD
JF	Indoor unit-testing board comm. Error (after 3-minutes)	TBD
rF	RF module error (once powered, the MCU tries to send commands, via SPI, to RF, if RF doesn't receives it, error shows)	TBD
Uu	Solar AC: battery bank discharged too much and the output voltage is lower than 295V	TBD
no	For VRF groups: DC unit's display board can not receive any data from the fixed speed comp. unit, will show "no" after 8 seconds	TBD
E6+IDU Temp.	Communication error (ID display-OD main board) and outdoor temperature sensor error	TBD
E7+ODU Temp.	Communication error (ID unit-OD unit) and outdoor temperature sensor error	TBD
Fu	AHU or RT: dust sensor error	TBD
e2	Warning: water flow low	TBD
e3	Oil level low protection	TBD
e7	System pressure difference protection	TBD
eA	Heat exchanger-pressure transducer sensor error (similar to lower pressure transducer protection)	TBD
eC	Oil-pressure transducer sensor error (similar to lower pressure transducer protection)	TBD
e0	Economizer-discharge temp. sensor error	TBD
e9	Economizer-discharge pressure sensor error	TBD
eF	Compressor brand sensor error	TBD
bH	Water pump temp. sensor	TBD
oE	Any other error that the outdoor unit needs to stop	TBD
E8	Anti-high temperature protection	Running LED-Off 3S, Blinks 8 times
E9	Anti-cold blowing (discharging) protection	Running LED-Off 3S, Blinks 9 times
F1	Indoor air temp. sensor error/bad-broken, shorted	Cooling LED-Off 3S, Blinks 1 time
F2	Indoor coil temp. sensor error/bad-broken, shorted…	Cooling LED-Off 3S, Blinks 2 times
F4	Outdoor coil temp. sensor error/bad-broken, shorted…	Cooling LED-Off 3S, Blinks 4 times
F5	Compressor discharge temp. sensor error/bad-broken, shorted…	Cooling LED-Off 3S, Blinks 5 times
F7	Cooling-oil return error	Cooling LED-Off 3S, Blinks 7 times
FC	Slide door error, or air louver mechanism error	TBD
FE	Over-load sensor error	TBD
H8	Water level-high /overflow protection	Heating LED-Off 3S, Blinks 8 times
H9	Ele. heater error	Heating LED-Off 3S, Blinks 9 times
b7	Outlet temp. sensor error	Cooling LED-Off 3S, Blinks 22 times
b5	Inlet temp. sensor error	Cooling LED-Off 3S, Blinks 19 times
d1	DRM running mode 1
d2	DRM running mode 2
d3	DRM running mode 3

E0	Driving board communication error
E1	Indoor unit air temperature sensor error
E3	Indoor unit tube temperature sensor error
E6	System refrigerant high pressure protection
E7	System refrigerant low pressure protection
E8	Indoor unit fan motor no feedback
F1	Outdoor board IPM abnormal
F2	Outdoor board inverter abnormal
F3	Outdoor temperature sensor errors-discharge, tube, ambient air, etc.
F4	Anti-freeze protection
F5	Outdoor compressor discharge temperature too high
F6	Outdoor compressor overload protection
F7	Over current protection

Code#	Code Descriptions	What to check
H1	Protection-Refrigeration System High Pressure	Copper line vacuumed, leakage, refrigerant charge, fan motors working properly, filters/coils are clean
H2	Protection-Refrigeration System Low Pressure	Copper line leakage, refrigerant charge, ambient temperatures
E1	AC Voltage too high or too low	AC voltage ranges
E2	DC Voltage too high	AC voltage ranges
E3	DC Voltage too low	DC voltage ranges
E4	Protection-AC input current too high	AC current ranges, surge protector
E5	Protection-Compressor current too high	Compressor-resistances between any 2 leads (less than 1 Ohm), and any 1 lead against ground (must be OL), refrigerant charge too much, fan motor failure
E6	System Pressure too high	Check refrigerant levels
E7	Compressor-Phase loss	Compressor-lead wire connections matched diagrams, correct circuit breaker/wire connections
E8	Protection-IPM not working properly	IPM board components
E9	Starting failure	AC input, DC input, compressor, control boards, etc.
F0	Driving board-communication error	Control board
F1	Indoor unit temperature sensor error	Temperature sensor connection and resistance
F2	Outdoor unit ambient temperature sensor error	Temperature sensor connection/contact and resistance
F3	Indoor unit coil sensor error	Temperature sensor connection/contact and resistance
F4	Outdoor unit defrost sensor error	Temperature sensor connection/contact and resistance
F5	Compressor discharge temperature sensor error	Temperature sensor connection/contact and resistance
F6	Protection-Indoor unit coil anti-freeze	Filter/coil clean, fan motor working, refrigerant charge
F7	Protection-compressor discharge tube high temperature	Copper line vacuumed properly, filter/coil clean, temperature sensor connection/contact and resistance
F8	Outdoor fan motor speed is not satisfied	Fan blade clogged, motor resistance, control board
F9	Protection-Refrigerant leaking	Refrigerant leaking, all connections especially flare/nuts
FA	Protection-indoor fan motor no feedback	Fan motor wire connection/resistances, control board
FC	Outdoor unit fan motor error	Fan motor wire connection/resistances, control board

ERROR CODE	DESCRIPTION	TROUBLE SHOOTING
E1	Indoor Unit-Air Temperature Sensor error	Check resistances, contacts to the board
E2	Indoor Unit-Tube Temperature Sensor error	Check resistances, contacts to the board
E3	Indoor Unit-Fan Motor no feedback/error	Check motor, resistances, contacts to the board and filter
E4	Outdoor Unit-voltage between + and – lower than 40VDC (12-24K 48V) or 20V (09K 24V)	Check charge controller, panel specs/connections
E5	Outdoor Unit-voltage between + and – higher than 60VDC (12-24K 48V) or 30V (09K 24V)	Check charge controller, panel specs/connections
E6	Outdoor Unit-refrigeration pressure too low	Check refrigerant pressure, and low pressure switch
E7	Outdoor Unit-refrigeration pressure too high	Check fan motor, high pressure switch, and clean the filter
E8	Outdoor Unit-refrigerant is low	Check refrigerant pressure, sensor, potential leak points before recharging
E9	Indoor Unit-Protecting the coil from becoming frozen	Check refrigerant pressure, charge, sensor, potential leak points before recharge. Check Indoor fan motor, filter, and clean the coil.

Outdoor Unit Failure Description	LED 1	LED 2	LED 3	Possible Cause
Lights will flash every second for the following faults
Normal Operation	x	x	x
Outdoor coil temperature sensor issue	★	X	★	Outdoor coil sensor connection is loose Outdoor coil temperature sensor has failed Outdoor control board has failed
Compressor exhaust temperature sensor issue	★	X	X	Compressor exhaust temperature sensor connection is loose Compressor exhaust temperature sensor has failed Outdoor control board has failed
Communication failure between Indoor Unit and Outdoor Unit	X	X	○	Communication cable connection is loose Communication cable has failed Connection between the filter board and the outdoor control board is incorrect or loose Connection between the filter board and the terminal is incorrect or loose Indoor unit control board failure PFC board failure Power board failure Outdoor control board failure
Current Overload Protection	★	○	X	Fan motor is running abnormally Condenser and evaporator are dirty Air inlet and outlet are abnormal
Maximum Current Protection	★	○	★	Outdoor control board has a short circuit Drive board has a short circuit Other component has a short circuit
Communication issue between Outdoor Unit and Driver	X	★	★	Connection wires connection loose Outdoor board or drive board failure
Outdoor EEPROM issue	★	★	★	EEPROM chip is loose EEPROM chip is inserted backwards EEPROM chip has failed
Compressor exhaust temperature is too high protection	X	○	★	Compressor exhaust temperature sensor failure Unit does not have enough refrigerant
Outdoor ambient temperature sensor issue	★	★	X	Outdoor ambient temperature sensor connection is loose Outdoor ambient temperature sensor failure Outdoor control board failure
Compressor shell temperature too high protection	X	★	○	Compressor exhaust temperature sensor connection is loose Unit does not have enough refrigerant
Anti-freeze protection with cooling or Overload protection with heating in Indoor Unit	X	○	○	Indoor unit coil temperature sensor is loose Indoor unit coil temperature sensor failure Indoor unit control board failure Refrigerant system is running abnormally
Compressor drive issue	○	X	○	Outdoor drive board failure Compressor failure Outdoor control board failure
Locked rotor outdoor fan motor protection	○	○	★	Outdoor fan motor connection is loose Outdoor fan has blockage Fan motor failure Outdoor control board failure
Outdoor coil anti-overload protection with cooling	X	★	X	System has too much refrigerant Outdoor fan motor failure Dirty condenser Air inlet and/or air outlet of the indoor unit or outdoor unit is blocked or abnormal
IPM module protection	X	○	X	IPM board failure Outdoor unit fan is broken Outdoor unit motor failure Outdoor unit fan is blocked Condenser requires cleaning Outdoor unit installed improperly
PFC protection	○	X	X	PFC failure Outdoor Unit drive board failure
Compressor preheating process	○	★	○	Unit in normal mode during cold weather
Outdoor board chip issue	★	X	○	Wrong drive board Wrong compressor
AC voltage too high or too low protection	★	★	○	Supply voltage is higher or lower than normal Internal voltage supply of the unit is higher or lower than normal
DC compressor	○	○	X	Outdoor drive board failure Compressor failure
Outdoor ambient temperature too low protection	★	○	○	Outdoor ambient temperature is too low
Light flash every 2 seconds for the following faults
Outdoor radiator overheated protection	○	X	X	Radiator sensor failure Detection circuit of the sensor on control panel failure
System high pressure failure protection	○	○	X	Pressure switch failure Pressure detection switch on the control panel failure System pressure measurement exceeds system limit

No.	LED 1	LED 2	LED 3	Reason current operating frequency of the compressor is limited
Lights will flash every second for the following faults
1	○	○	○	Normal frequency increasing and decreasing. No limitation
2	x	x	★	Frequency decreasing or prohibition of frequency increasing caused by over current
3	x	★	★	Frequency decreasing or prohibition of frequency increasing caused by anti-freezing of refrigeration or anti-overload in heating
4	★	x	★	Frequency decreasing or prohibition of frequency increasing caused by compressor discharge temperature is too high
5				Limit to maximum operating frequency caused by low voltage
6	★	★	★	Operation at fixed frequency (in case of capability measuring or compulsory operation at fixed frequency)
7	○	x	x	Protective frequency decreasing against outdoor overload (over power, over frequency conversion rate, over torque, and detection of DC under-voltage)
8	★	x	x	Frequency decreasing caused by indoor and outdoor communication fault
9	x	★	○	Frequency decreasing or prohibition of frequency rising protection against overload of outdoor coiled pipe
10	x	★	x	Frequency decreasing or prohibition of frequency increasing for power-saving when it is being used simultaneously with other applications

Error Code	Error	Reason current operating frequency of the compressor is limited
EA	Error code indicates an issue with communication between the display board and control board	Connection between display board and control board is loose Indoor control board failure Wiring to the display board is incorrect

Error Code	Running	Timer	Sleep	Power	Issue	Cause may be one of the following:
Error Code	1	2	3	4	Issue	Cause may be one of the following:
0					Normal Operation
1	X	○	X	X	Outdoor coil temperature sensor failure	Outdoor temperature sensor connection is loose Outdoor temperature sensor failure Indoor control board failure
2	X	○	★	X	Compressor exhaust temperature sensor issue	Compressor exhaust temperature sensor connection is loose Compressor exhaust temperature sensor failure Outdoor control board failure
5	★	○	X	X	IPM module protection	IPM board failure Outdoor unit fan is broken Outdoor unit fan motor failure Outdoor unit fan motor is blocked Condenser is dirty Outdoor unit not installed properly
6	★	○	X	★	AC voltage out of range protection	Supplied voltage is higher or lower than normal Indoor unit supply voltage is higher or lower than normal
7	★	○	★	X	Communication failure between Indoor Unit and Outdoor Unit	Communication cable connection is loose Communication cable failure Connection between the filter board and the outdoor control board is incorrect or loose Connection between the filter board and the terminal is incorrect or loose Indoor control board failure PFC board failure Power board failure Outdoor control board failure
8	★	○	★	★	Current overload protection	Fan motor is running abnormally Condenser and evaporator are dirty Air inlet and/or outlet is abnormal
9	X	X	○	X	Maximum current protection	Outdoor control board has a short circuit Drive board has a short circuit Other component has a short circuit
10	X	X	○	★	Communication issue between Outdoor unit and driver	Connection wires connection loose Outdoor board or drive board failure
11	X	★	○	X	Outdoor EEPROM issue	EEPROM chip is loose EEPROM chip installed backwards EEPROM chip failure
12	X	★	○	★	Outdoor ambient temperature too low	Outdoor ambient temperature is too low
13	★	X	○	X	Compressor exhaust temperature too high protection	Compressor exhaust temperature sensor failure Refrigerant level is low
14	★	X	○	★	Outdoor ambient temperature sensor issue	Outdoor ambient temperature sensor connection is loose Outdoor ambient temperature sensor failure Outdoor control board failure
15	★	★	○	X	Compressor shell temperature too high protection	Compressor exhaust temperature sensor connection is loose Refrigerant level is low
16					Anti-freeze protection during cooling, or overload protection during heating	Indoor coil temperature sensor connection is loose Indoor coil temperature sensor failure Indoor control board failure Refrigerant system is abnormal
17					PFC protection	PFC failure Outdoor drive board failure
18					DC compressor start failure	Outdoor drive board failure Compressor failure
19	X	X	X	○	Compressor drive issue	Outdoor drive board failure Compressor failure Outdoor control board failure
20	★	X	X	○	Outdoor fan motor-locked rotor protection	Outdoor fan motor connection loose Outdoor fan is blocked Outdoor fan is broken Outdoor control board failure
21					Outdoor coil anti-overload protection while cooling	Too much refrigerant in system Outdoor fan motor failure Outdoor fan is broken Dirty condenser Air inlet and/or outlet of Indoor unit and/or Outdoor unit are abnormal
22					Compressor preheating process	This is a normal function of the unit during cold weather
24					Outdoor board chip issue	Incorrect drive board installed Incorrect compressor installed
26					Outdoor unit radiator overheated	Radiator sensor failure Control panel detection circuit on the sensor failure
27					High system pressure protection	Pressure switch failure Pressure detection switch on the control panel failure Measured system pressure exceeds system limit
33	○	X	X	★	Indoor unit temperature sensor failure	Indoor unit temperature sensor is loose Indoor unit temperature sensor failure
34	○	X	★	X	Indoor unit coil temperature sensor failure	Indoor coil temperature sensor is loose Indoor coil temperature sensor failure Indoor control board failure
36	○	★	X	★	Communication failure between Indoor unit and Outdoor unit	Communication cable is loose Communication cable has failed Connection between filter board and Outdoor unit control board is incorrect or loose Connection between filter board and terminal is incorrect or loose
38	○	★	★	★	Indoor EEPROM failure	EEPROM chip is loose Indoor control board failure
39	○	X	★	★	Indoor fan motor running abnormally	Fan motor is blocked Fan motor cord connection is loose Fan motor failure Indoor control board failure
41	★	★	○	★	Indoor grounding protection failure	Indoor control board failure

Codes	Description	Possible Reasons	Suggestion for User	Technician Trouble-Shooting
E1	Condensate Full in drain pan	Drain pan dirty Drain hose clogged Water level switch failure Loose connection Bad control board/ components	Check drain hose to see if it is clogged. If drain hose does not appear clogged, contact your installer or service technician.	Shut off power Check one by one, each of the possible issues listed at left. For a quick diagnosis, we suggest your technician makes an appointment with one of our YMGI technical support agents, and calls us while at the job site. To help speed up support, check the unit, and please have the model number, and serial number ready of the unit(s) being serviced ready, and the suspected unit problem, before contacting YMGI technical support. HVAC Technician needs to be physically at the job site, use right tools and be experienced to find all the possible causes to correct or fix the issues.
E2	Indoor air temp. sensor failure	Bad temperature sensor Loose connection Damaged wires Bad control board/components	Lift up grille/cover to check if the sensor looks bad or drops out of holding socket/ pocket Call your installer or service technician.
E3	Indoor coil copper tube sensor failure	Bad temperature sensor Loose connection Damaged wires Bad control board/components
E4	Abnormal cooling	Dirty filters/coils, refrigerant leaks over time Pipe too long Kinks or clogging in pipe line or valves Pipe damage Sensor failure Compressor or board or other component failures, etc.	Regularly check and clean indoor unit filters, indoor and outdoor coils. The service valves at outdoor unit should be generally cool in cooling mode, hot in heating mode. Call your installer or service technician to examine unit.
E5	Abnormal heating
E6	Cooling-outdoor coil low temp. protection	Outdoor too cold to run cooling mode Windy Too much refrigerant Short piping	Shut off the unit Cooling: wait until weather allows the unit to re-start, or switch to alternative cooling equipment which allows lower ambient cooling Heating: wait until weather allows the unit to re-start, or switch to base-board heater, gas furnace or other alternative heating sources during cold hours/days.	Check if these are caused by installation or component failure In some instances, there may be nothing abnormal. The unit may have entered a protection mode, which means the current ambient temperature is outside the systems operating range. If there is a problem, you may need to do a full diagnostic to find all the causes and correct or repair the problem.
E7	Cooling-Indoor coil anti-freeze protection	Dirty filter/coils, indoor fan motor failure Loose blower wheel/motor connection Too much or less refrigerant Pipe/cap. tube/valve clogging
E8	Heating-outdoor coil high temperature protection	Outdoor temperature too warm to run heating mode Too much refrigerant Short piping
E9	Heating-indoor coil anti-over heat protection	Dirty filter/coils, indoor fan motor failure Loose blower wheel/motor connection Too much refrigerant Pipe/cap. tube/valve clogging
E0	Heating-outdoor coil too cold protection	Outdoor temperature is too cold to run heat pump/heating.

Error Code	Error Code - Light Signal	Error Indicated	Trouble Shooting
F4	SLEEP & TIME light blink	Over-current protection	Check for abnomalities in the incoming power voltages, wire sizing/connections, system refrigerant charge level, vacuum level, restrictions etc.
F5	WARM, SLEEP & TIME lights solid	EEPROM read error	Check wire connections. Shut off power, wait 30 seconds and restore power.
F6	POWER, TIME light blink, SLEEP light solid	PG motor error	Check and debug the PG motor, its driving circuit, or feedback control circuit
F7	POWER, SLEEP lights blink & TIME light solid	RT indoor air temperature sensor error	Chech sensor wire continuity, sensor resistance and installation
F8	POWER, TIME & SLEEP light blink	PT indoor coil pipe temperature sensor error	Check sensor wire continuity, sensor resistance and installation
F9	POWER & SLEEP light blink	OT outdoor coil pipe termperature sensor error	Check sensor wire continuity, sensor resistance and installation

Check parts	Serial number	Malfunction content	Indoor unit display status Code
Indoor parts	1	The communication faults in the indoor and outdoor units	F1
	2	Indoor ambient temp. sensor fault	F2
	3	Indoor coil temperature sensor fault (Includes: Inlet, middle of pipe, outlet.)	F3
	4	Indoor fan fault	F4
Outdoor parts	1	Outdoor module fault	F5
	2	Outdoor ambient temp. sensor fault	F6
	3	Outdoor coil temp. sensor fault	F7
	4	Compressor discharge temp. sensor fault	F9
	5	Compressor drive abnormal fault	FC
	6	Phase lacking or phase sequence fault	FD
	7	Outdoor DC Motor	FH

Check parts	Serial number	Protection content	Indoor unit display status Code
Indoor parts	1	Evaporator temp protection	P1
Outdoor parts	1	Overheat, over current protection of inverter module	P2
	2	Over current protection	P3
	3	Compressor discharging temp. protection	P4
	4	Overheat of compressor top protection	P5
	6	Power supply over current/over voltage protection	P7
	9	High temp of condenser protection	PA
	10	High temp of outdoor ambient protection	PC

Error Code	Self-Check code of Running Lamp	Error Indicated
"dF" or Heating Icon blinks	Blinks 1 time/sec	Defrost Indication
Fan Motor Icon not Lit	Blinks 1 time/ sec	Anti-cold Wind
E2	Blinks 1 time/ 8 sec	Room Temperature Sensor fault
E3	Blinks 2 times / 8 sec	Coil Temperature Sensor
E8	Blinks 3 times / 8 sec	Overheat Protection/Defrosting
E5	Blinks 6 times / 8 sec	Indoor Fan Fault
E7	Blinks 7 times / 8 sec	External Feedback Fault
E0	Blinks 3 times / 8 sec	Open Door Fault
E1	Blinks 4 times / 8 sec	Outdoor Tube Temperature Sensor Fault
E6	Blinks 6 times / 8 sec	(EEPROM) Communication Failure(s)
FF	Blinks 1 time / sec	Outdoor Temperature Exceeds Operating Limits of System.

LED	Running Lamp Blinks	Error	The reason of fault and solution
F1	1	communication fault	Check whether the connection of the outdoor unit and indoor unit is one to one, otherwise connect the L, N and communication line of the indoor unit and outdoor unit one to one. Measure whether the voltage between the zero line and the communication line is 18V-30AC half-wave signal, check whether the communication circuit on the indoor and outdoor electric control board has been damaged, otherwise replace it. Check whether the LED on the outdoor power board has been on, otherwise replace the electric control board. Check whether the unit is abnormal caused by the external interference, if it is, then find the interfering source, and removes it.
F2	2	ambient temp. sensor fault	Check whether the resistance of sensor is normal, otherwise replace it. Check whether the sensor wire is short circuit or open circuit, and whether the plug is well contacted, whether there is welding off or rosin joint on the electric control board, repair it if there is any above. When the 1 and 2 are both normal, then the components or integrated circuit is damaged, the electric control board should be replaced.
F3	3	coil pipe temp. sensor of indoor unit fault (inlet, middle, outlet)	Check whether the resistance of sensor is normal, otherwise replace it. Check whether the sensor wire is short circuit or open circuit, and whether the plug is well contacted, whether there is welding off or rosin joint on the electric control board, repair it if there is any above. When the 1 and 2 are both normal, then the components or integrated circuit is damaged, the electric control board should be replaced.
F4	4	fan motor of indoor	Check whether the contact of the plug of the motor wire unit fault and socket is well, making sure well contact. Check whether the indoor motor has damaged, the motor should be replaced when it is damaged. Check whether the controllable silicon and other components on the electric control board have damaged, replace the controllable silicon or electric control board when they are damaged.
F5	5	module of outdoor unit fault	Check whether the connection of the compressor is reliable, otherwise connect firmly again. Check whether the fixation between the IPM module and the radiator is firm. Check whether the compressor is well, otherwise replace it. Check whether the IPM module is abnormal, otherwise replace it.
F6	6	ambient temp. sensor of outdoor fault	Check whether the resistance of sensor is normal, otherwise replace it. Check whether the sensor wire is short circuit or open circuit, and whether the plug is well contacted, whether there is welding off or rosin joint on the electric control board, repair it if there is any above. When the 1 and 2 are both normal, then the components or integrated circuit is damaged, the electric control board should be replaced.
F7	7	coil pipe temp. sensor of outdoor unit fault	Check whether the resistance of sensor is normal, otherwise replace it. Check whether the sensor wire is short circuit or open circuit, and whether the plug is well contacted, whether there is welding off or rosin joint on the electric control board, repair it if there is any above. When the 1 and 2 are both normal, then the components or integrated circuit is damaged, the electric control board should be replaced.
F8	8	suction temp. sensor of compressor fault	Check whether the resistance of sensor is normal. If not, replace it. Check whether the sensor wire is short circuit or open circuit, and whether the plug is well contacted, whether there is welding off or rosin joint on the electric control board, repair it if there is any above. When the 1 and 2 are both normal, then the components or integrated circuit is damaged, the electric control board should be replaced.
F9	9	discharge temp. sensor of compressor fault	Check whether the resistance of sensor is normal, otherwise replace it. Check whether the sensor wire is short circuit or open circuit, and whether the plug is well contacted, whether there is welding off or rosin joint on the electric control 9 board, repair it if there is any above. When the 1 and 2 are both normal, then the components or integrated circuit is damaged, the electric control board should be replaced.
FA	10	inductor of current or voltage fault	Check whether inductor of current or voltage have been damaged, they should be replaced if they are fault.
FC	11	compressor drive fault	Power on again, and check the operation of the compressor is normal. Check whether the connection of the compressor is reliable, otherwise repair. Check whether the components on the electric control board have been damaged, if they are damaged, the components or the electric control board should be replaced.
FD	12	phase lacking or phase sequence fault	Check power wire voltage or change two power wires.
FE	13	gas return sensor fault (include A,B,C,D)	Check whether the resistance of sensor is normal, otherwise replace it. Check whether the sensor wire is short circuit or open circuit, and whether the plug is well contacted, whether there is welding off or rosin joint on the electric control board, repair it if there is any above. When the 1 and 2 are both normal, then the components or integrated circuit is damaged, the electric control board should be replaced.
FF	14	other fault
P1	1	temp. of evaporator protection	Check whether the filter of indoor unit is too dirty, and it should be cleaned when it is too dirty. Check whether it has barrier around indoor unit, it should be remove if it has. Check whether the indoor motor is damaged, it should be replaced motor or electrical control board when it is damaged.
P2	2	overheat, over current protection of inverter module	Check whether the fixation between the IPM module and the radiator is firm. Check whether the compressor is well, otherwise replace it. Check whether the IPM module is abnormal, otherwise replace it.
P3	3	over current protection	Check whether the ambient temperature exceeds the operation range for the air conditioner Check whether the current detection circuit is abnormal, the electric control should be replaced when it is abnormal.
P4	4	discharge temp. of compressor	Check whether the air condition system and pressure are normal. 10 protection Check whether the sensor, connecting wire of the sensor and the detection circuit are abnormal.
P5	5	over heat of compressor top protection	Check whether the air condition system and pressure are normal. Check whether the sensor, connecting wire of the sensor and the detection circuit are abnormal.
P6	6	suction temp. of compressor protection	Check whether the air condition system and pressure are normal. Check whether the sensor, connecting wire of the sensor and the detection circuit are abnormal.
P7	7	low or high voltage protection	Check whether the supply voltage is out of range from 150 to 270V Check the voltage detection circuit of the IPM base board is abnormal, if it is abnormal, the IPM base board or the electric control board should be replaced.
P8	8	low presser of gas return protection	Check whether the pressure is normal when the unit is running. If it is abnormal, check for leakage and welding, add refrigerant.
P9	9	high pressure of discharge protection	Check whether the pressure is normal when the unit is running, if it is abnormal, should detect the leakage and welding, add refrigerant.
PA	10	high temp. of condenser protection	Check whether the condenser of outdoor unit is too dirty, and it should be cleaned when it is too dirty. Check whether it is running at bad condition long time. Check whether senor and wire are normal.
PC	11	high temp. of outdoor ambient protection	Check the outdoor ambient temperature is too high or there is heat source around the outdoor unit. Check whether the sensor and sensor wire are normal.
PF	12	other protection

LED	failure	The reason of fault and solution
F1	communicate fault	Check whether the connection of the outdoor unit and indoor unit is one to one. Check whether the unit is abnormal caused by the external interference, if it is, then find the interfering source, and removes it. Check whether the electrical control board is damage, it should be replaced when it is damaged.
F2	indoor temp. sensor fault	Check whether the resistance of sensor is normal, otherwise replace it. Check whether the sensor wire is short circuit or open circuit, and whether the plug is well contacted, whether there is welding off or rosin joint on the electric control board, repair it if there is any above. When the 1 and 2 are both normal, then the components or integrated circuit is damaged, the electric control board should be replaced.
F3	outlet e temp. sensor of indoor unit coil pipe fault	Check whether the resistance of sensor is normal, otherwise replace it. Check whether the sensor wire is short circuit or open circuit, and whether the plug is well contacted, whether there is welding off or rosin joint on the electric control board, repair it if there is any above. When the 1 and 2 are both normal, then the components or integrated circuit is damaged, the electric control board should be replaced.
F3	suction temp. sensor of indoor unit coil pipe fault	Check whether the resistance of sensor is normal, otherwise replace it. Check whether the sensor wire is short circuit or open circuit, and whether the plug is well contacted, whether there is welding off or rosin joint on the electric control board, repair it if there is any above. When the 1 and 2 are both normal, then the components or integrated circuit is damaged, the electric control board should be replaced.
F3	middle temp. sensor of indoor unit coil pipe fault	Check whether the resistance of sensor is normal, otherwise replace it. Check whether the sensor wire is short circuit or open circuit, and whether the plug is well contacted, whether there is welding off or rosin joint on the electric control board, repair it if there is any above. When the 1 and 2 are both normal, then the components or integrated circuit is damaged, the electric control board should be replaced.
F4	PG motor fault	Check whether the contact of the plug of the motor wire and socket is well, making sure well contact. Check whether the indoor motor has damaged, the motor should be replaced when it is damaged. Check whether the controllable silicon and other components on the electric control board have damaged, replace the controllable silicon or electric control board when they are damaged.
P2	protection of module fault	Check whether the connection of the compressor is reliable, otherwise connect firmly again. Check whether the fixation between the IPM module and the radiator is firm. Check whether the compressor is well, otherwise replace it. Check whether the IPM module is abnormal, otherwise replace it.
P3	over current of outdoor unit	Check whether the ambient temperature exceeds the operation range for the air conditioner Check whether the current detection circuit is abnormal, the electric control should be replaced when it is abnormal.
P4	discharge temp. of compressor too high, outside ambient temp. too high, temp. switch of compressor crust cut off, temp. of module too high.	Check whether the pressure is normal when the unit is running, if it is abnormal, should detect the leakage and welding, add refrigerant. Check whether ambient temp. is too high or too low, when the temp. more than -20 degree and less 55 degree, it can disappear automatically. Communication interference, ground wire and communication wire can’t be put in one cable. Check whether temp. switch of compressor is damage, it should be replace if it damaged.
P7	DC voltage abnormal of outdoor unit	Check whether the supply voltage is out of rang from 150 to 270V Check the voltage detection circuit of the IPM base board is abnormal, if it is abnormal, the IPM base board or the electric control board should be replaced.
P8	lack refrigerant or reverse valve fault	Check whether the high and low pressure valves have been opened, otherwise open the valves. Check whether the indoor coil pipe temperature sensor is normal, if it is abnormal, the sensor should be replaced. Check the system pressure is abnormal, if it is abnormal, should detect leakage repairing welding and adding the refrigerant.
F6	outside sensor fault	Check whether the resistance of sensor is normal, otherwise replace it. Check whether the sensor wire is short circuit or open circuit, and whether the plug is well contacted, whether there is welding off or rosin joint on the electric control board, repair it if there is any above. When the 1 and 2 are both normal, then the components or integrated circuit is damaged, the electric control board should be replaced.
FC	outdoor unit drive fault, start compressor failure	Power on again, and check the operation of the compressor is normal. Check whether the connection of the compressor is reliable, otherwise repair. Check whether the components on the electric control board have been damaged, if they are damaged, the components or the electric control board should be replaced.

Error Code	Content
E0	Outdoor Unit Error
E1	High Pressure Protection
E2	Discharge Low Temperature Protection
E3	Low Pressure Protection
E4	Excess Discharge Temperature Protection of Compressor
Ed	Low Refrigerant Protection
EN	Copressor Power Protection
F0	Bad Performance of the Outdoor Mainboard
F1	High Pressure Sensor Error
F3	Low Pressure Sensor Error
F5	Compressor 1 Discharge Temperature Sensor
F6	Compressor 2 Discharge Temperature Sensor Error
F7	Compressor 3 Discharge Temperature Sensor Error
F8	Compressor 4 Discharge Temperature Sensor Error
F9	Compressor 5 Discharge Temperature Sensor Error
FA	Compressor 6 Discharge Temperature Sensor Error
Fb	Compressor 2 Top Temperature Sensor Error
FC	Compressor 2 Current Sensor Error
Fd	Mode Exchanger Outlet Pipe Temperature Sensor Error
FE	Compressor 4 Current Sensor Error
FF	Compressor 5 Current Sensor Error
FH	Compressor 1 Current Sensor Error
FJ	Compressor 6 Current Sensor Error
FL	Compressor 3 Current Sensor Error
Fn	Mode Exchanger Inlet Pipe Temperature Sensor Error
FP	Malfunction of DC motor
FU	Compressor 2 Top Temperature Sensor Error
J1	Compressor 1 Over-current Protection
J2	Compressor 2 Over-current Protection
J3	Compressor 3 Over-current Protection
J4	Compressor 4 Over-current Protection
J5	Compressor 5 Over-current Protection
J6	Compressor 6 Over-current Protection
J7	4-way Valve Blow-by Protection
J8	System Pressure Over-Ratio Protection
J9	System Pressure Under-Ratio Protection
JA	Protection of Abnormal Pressure
JC	Protectionof Water Flow Switch
JE	Oil return pipe is blocked
JF	Oil return pipe is leaking
JL	Protection of Low High-pressure
b1	Outdoor Ambient Temperature Sensor Error
b2	Defrosting Temperature Sensor 1 Error
b3	Defrosting Temperature Sensor 2 Error
b4	Subcooler Liquid-out Temperature Sensor Error
b5	Subcooler Gas-out Temperature Sensor Error
b6	Gas-liquid separator inlet temperature sensor error
b7	Gas-liquid separator outlet temperature sensor error
b8	Outdoor Humidity Sensor Error
b9	Heat Exchanger Gas-out Temperature Sensor Error
bA	Oil-return Temperature Sensor Error
bC	Compressor 1 Top Temperature Sensor Detachment Protection
bE	Malfunction of entry tube temperature sensor of condensor
bF	Malfunction of exit tube temperature sensor of condenser
bH	System Clock Malfunction
bJ	High and low pressure sensors are connected inversely
bL	Compressor 2 Top Temperature Sensor Detachment Protection
Fd	High pressure switch
P0	Compressor Drive Board Error
P1	Compressor Drive Board Malfunction
P2	Protection of Compressor Drive Board Power Supply
P3	Protection of Compressor Drive Board Module Reset
P4	PFC Over current protection
Pn	PFC Module Overheat
PE	Phase loss protection of compressor
P5	AC over current
P6	IPM over current
P8	IPM module overheat
P9	Desynchronization protection
PH	Busbar over voltage protection
PC	Phase current detection fault
PL	Busbar under voltage protection
PF	Capacitor charge error
PU	Demagnitization protection
H0	Error of Fan Drive Board
H1	Malfunction of Fan Drive Board
H2	Protection of Fan Drive Board Power Supply
-	---

Error Code	Content
U2	Outdoor Unit Capacity Code/Jumper Cap Setting Error
U3	Phase Sequence Protection of Power Supply
U4	Protection of Lack of Refrigerant
U5	Wrong Address of Compressor Drive Board
U6	Valve Abnormal Alarm
U8	Indoor Unit Tube Malfunction
U9	Outdoor Unit Tube Malfunction
UC	Master indoor unit is successfully set
UE	Refrigerant Charging is ineffective
UF	Indoor Unit Identification Error of Mode Exchanger
UL	Emergency Operation DIP switch setting of the compressor is wrong
C0	Communication between indoor unit and outdoor unit and the communication between indoor unit and wired controller have malfunction
C1	485 Communication Error between main controller and debugging controller
C2	Communication error between master control and inverter compressor drive
C3	Communication error between master control and inverter fan motor drive
C4	Error of Lack of Indoor Unit
C5	Alarm of Indoor Unit Project Number Collision
C6	Alarm of Wrong Number of Outdoor Unit
C7	Mode Exchanger Communication Error
Cb	Outflow of Units IPAddress
Cd	CommunicationFailure Between Mode Exchanger and Outdoor Unit
CE	Communication Failure Between Mode Exchanger and Indoor Unit
CF	Error of Multiple Master Indoor Unit
CH	Rated capacity is too high.
CJ	System addresses is incompatible.
CL	Rated capacity is too low.
Cn	Indoor and Outdoor NetworkError of Mode Exchanger
CP	Error of Multiple Master Wired Controller
CU	Communication Error between Indoor Unit and Remote Receiver
Cy	CommunicationError of No Master in Mode Exchanger

Error Code	Content
A0	Unit is waiting for debugging
A1	Check the compressor operation parameters
A2	After-sales Refrigerant Reclaim
A3	Defrosting
A4	Oil return
A5	Online Testing
A8	Vacuum-pumping Mode
Ab	Emergency Stop
Ad	Operation Restriction
AC	Cooling
AF	Fan
AH	Heating
AJ	Filter Clean Reminder
AU	Remote Urgent Stop
n3	Compulsory defrosting
qE	EVI Operating Mode

NO.	LED1 (GREEN)	LED2 (RED)	LED3 (RED)	Status	Trouble Shooting
1	On	Off	Off	Cooling mode - normal operation	N/A
2	On	On	Off	Heating mode - normal operation	N/A
3	On	On	On	Defrosting mode - ongoing	N/A
4	On/On (AC/HP)	Off/On (AC/HP)	Blinks 3 times/ 5 seconds	Outdoor defrost temperature sensor failure	Check connectivity or resistance of this sensor, or replace with a new sensor.
5	On	Off	Blinks 1 times/ 5 seconds	Cooling Mode, High Pressure Protection is ON. The whole unit stops working until the problem is cleared, or power is turned off, and then restored, or another unit function is selected.	Check possible causes: Mechanical or refrigerant blockage at the filter/drier. Too much refrigerant. 4-way valve is damaged. Faulty TEV or others. Electrical wiring connection is faulty. Component is damaged. Or switch Unit funtion.
6	On	Off	Blinks 2 times/ 5 seconds	Cooling Mode, Low Pressure Protection is ON. The whole unit stops working until the problem is cleared, or power is turned off, and then restored, or another unit function is selected.	Check possible causes: Refrigerant is very low 4-way valve is damaged. Faulty TEV or others. Electrical wiring connection is faulty. Component is damaged. Or switch Unit funtion.
7	On	On	Blinks 1 times/ 5 seconds	Heating Mode, High Pressure Protection is ON. The whole unit stops working until the problem is cleared, or power is turned off, and then restored, or another unit function is selected.	Check possible causes: Mechanical or refrigerant blockage at the filter/drier. Too much refrigerant. 4-way valve is damaged. Faulty TEV or others. Electrical wiring connection is faulty. Component is damaged. Or switch Unit funtion.
8	On	On	Blinks 2 times/ 5 seconds	Heating Mode, Low Pressure Protection is ON. The whole unit stops working until the problem is cleared, or power is turned off, and then restored, or another unit function is selected.	Check possible causes: Refrigerant is very low 4-way valve is damaged. Faulty TEV or others. Electrical wiring connection is faulty. Component is damaged. Or switch Unit funtion.

Malfunction	Possible Causes
Indoor ambient temperature sensor is open/short circuited	The wiring terminal between indoor ambient temperature controller is loosened or has poor contact There is a short circuit due to the trip-over of the parts on the controller Indoor ambient temperature sensor is damaged (Please check it by referring to the resistance table for temperature sensor) Main board is broken
Indoor evaporator temperature sensor is open/short circuited	The wiring terminal between the indoor evaporator temperature sensor and controller is loose or has poor contact There's a short circuit due to trip-over of the parts on the controller Indoor evaporator temperature sensor is damaged Main board is broken
Outdoor ambient temperature sensor is open/short circuited	The wiring terminal between the outdoor ambient temperature sensor and controller is loose or has poor contact There's a short circuit due to trip-over of the parts on the controller Outdoor ambient temperature sensor is damaged. (Please check it by referring to the resistance table for temperature sensor) Main board is broken
Low temperature prevention protection	Indoor ambient temperature is lower than 40 °F (5 °C) continuously Indoor ambient temperature sensor is damaged Main board is broken

Failure code	Content of defect
E2	Indoor temperature sensor failure
E3	Indoor coil temperature sensor failure
E4	High temperature protection of air outlet
E5	Outdoor coil temperature sensor failure
E8	Overheating protection/defrosting
E9	High temperature protection of outdoor coil

Protection & Error Codes

M6 (56),(57),(58),(59) Systems

M6 Single & Multi Zone (56),(57),(58),(59)

M8-G1-1198YM (56) On-Grid Solar Heat Pump

M8-G1-1198YM (56) Single Zone On-Grid Solar Heat Pump

M8-G2-1201YM (56) On-Grid Solar Heat Pump

M8-G2-1201YM Single Zone (56) On-Grid Solar Heat Pump

M8 (86) All DC Solar Heat Pump

M8 Single Zone (86) All DC Solar Heat Pump

(78)1 SERIES 18.8-21.5 SEER Systems

Symphony SOLO (78)1 SERIES 18.8-21.5 SEER Systems

M2 13 & 14 SEER Systems

M2 13 & 14 SEER Systems Error Codes

M3 Single Zone 13 SEER Systems

M3 Single Zone 13 SEER Systems Error Codes

M1 16 SEER (57)2,3 Systems

M1 16 SEER (57)2,3 Systems

Fault Code Display Table.

Protection Display Table.

M1 13 SEER Systems

M1 13 SEER Systems

M1 48 Series Systems

M1 48 Series Systems

M1 46 Series Systems

M1 46 Series Systems

VRF Systems

VRF System Error Codes

TABLE OF ERROR CODES FOR OUTDOOR UNIT

TABLE OF ERROR CODES FOR INDOOR UNIT

TABLE OF DEBUGGING CODES

TABLE OF STATUS CODES

SHCR Error Codes

SHCR Error Codes

PTAC Systems

PTAC Systems

PTAC Series 0 Error Codes

Protective Auto Diagnostics