Failure Code
E0
IDU & ODU Communication failure
The IDU & ODU wiring connection correct?
IDU/ODU PCB broken
E1
IDU Room Temperature sensor failure. IDU RT failure）
IDU sensor and PCB.
E2
IDU Coil temperature sensor failure.（IDU IPT failure）
IDU sensor and PCB.
E3
ODU Coil temperature sensor failure. (OPT)
ODU coil sensor and ODU PCB
E4
AC Cooling system abnormal
Gas leakage? 2-way or 3-way valve blocked etc.
E5
IDU/ODU mismatched failure (specially performance test on the production line)
E6
IDU PG Fan motor / DC fan motor works abnormal（IDU failure）
Fan motor, fan blade and PCB.
E7
ODU Ambient Temperature sensor failure
ODU ambient sensor and ODU PCB.
E8
ODU Discharge Temperature sensor failure.
ODU discharge sensor and ODU PCB.
E9
IPM / Compressor driving control abnormal.
ODU PCB , compressor, etc. EA ODU Current Test circuit failure
ODU PCB broken?
Eb
The Communication abnormal of Main PCB and Display board (IDU failure）
Display board and main PCB.
EE
ODU EEPROM failure.
ODU PCB broken?
Try to re-power on AC unit.
EF
ODU DC fan motor failure.
Fan motor, ODU PCB.
EU
ODU Voltage test circuit abnormal.
ODU PCB.
P0
IPM module protection.
ODU PCB
P1 Over / under voltage protection.
ODU PCB broken?
Power supply abnormal?
P2
Over current protection.
ODU PCB broken?
Power supply abnormal?
P4
ODU Discharge pipe Over temperature protection.
Please check the troubleshooting for detail.
P5
Sub-cooling protection on Cooling mode.
Please check the troubleshooting for detail.
P6
Overheating protection on Cooling mode.
Please check the troubleshooting for detail.
P7
Overheating protection on Heating mode.
Please check the troubleshooting for detail.
P8
Outdoor Over temperature/Under temperature protection.
Please check the troubleshooting for detail.
P9
Compressor driving protection (Load abnormal).
Please check the troubleshooting for detail.
PA
Communication failure for TOP flow unit/ Preset mode conflict. （IDU failure）
Please check the troubleshooting for detail.
F0
Infrared Customer feeling test sensor failure. （IDU failure）
Querying by press remote controller
F1
Electric Power test module failure. （IDU failure）
Querying by press remote controller
F2
Discharge temperature sensor failure PROTECTION.
Please check the troubleshooting for detail.
F3
ODU coil temperature failure PROTECTION..
Please check the troubleshooting for detail.
F4
Cooling system gas flow abnormal PROTECTION..
Please check the troubleshooting for detail.
F5
PFC PROTECTION
Please check the troubleshooting for detail.
F6
The Compressor lack of phase / Anti-phase PROTECTION.
Please check the troubleshooting for detail.
F7
IPM Module temperature PROTECTION
Please check the troubleshooting for detail.
F8
4-Way Value reversing abnormal..
Please check the troubleshooting for detail.
F9
The module temperature test circuit failure.
ODU PCB
FA
The compressor Phase-current test circuit failure.
ODU PCB
Fb
Limiting/Reducing frequency for Over load protection on Cooling/Heating mode.
Querying by press remote controller
FC
Limiting/Reducing frequency for High power consumption protection.
Querying by press remote controller
FE
Limiting/Reducing frequency for Module current protection ( phase current of compressor).
Querying by press remote controller
FF
Limiting/Reducing frequency for Module temperature protection.
Querying by press remote controller
FH
Limiting/Reducing frequency for Compressor driving protection.
Querying by press remote controller
FP
Limiting/Reducing frequency for anti-condensation protection..
Querying by press remote controller
FU
Limiting/Reducing frequency for anti-frost protection.
Querying by press remote controller
Fj
Limiting/Reducing frequency for Discharge over temperature protection.
Querying by press remote controller
Fn
Limiting/Reducing frequency for ODU AC Current protection.
Querying by press remote controller
Fy
Gas leakage protection
Please check the troubleshooting for detail.
bf
TVOC sensor failure IDU failure, optional）
Querying by press remote controller
bc
PM2.5 sensor failure IDU failure, optional）
Querying by press remote controller
bj
Humidity sensor failure. （IDU failure）
Querying by press remote controller
Note: Remote controller FAILURE CODE Querying function
As shown in the failure codes, some of the codes (Fb~bj) need to press remote control for inspection.
While unit on operation, press the ECO button 8 times with 8 seconds, the buzzer BIBI 2 times, you can inspect the special failure code as Fb ~Fn, bj etc.