Service Manual

 Troubleshooting 4 
2. General Troubleshooting
2.1 Error Display (Indoor Unit)
When the indoor unit encounters a recognized error, the operation lamp will flash in a corresponding series, the timer
lamp may turn on or begin flashing, and an error code will be displayed. These error codes are described in the following
table:
Operation
Lamp
Timer
Lamp
Display Error Information Solution
1 time
OFF E0
Indoor unit EEPROM parameter error TS18
2 times
OFF E1
Indoor / outdoor unit communication error TS19
3 times
OFF E2
Zero-crossing signal detection error(for some models) TS21
4 times
OFF E3
The indoor fan speed is operating outside of the normal range TS22
5 times
OFF E4
Indoor room temperature sensor T1 is in open circuit or has short
circuited
TS25
6 times
OFF E5
Evaporator coil temperature sensor T2 is in open circuit or has short
circuited
TS25
9 times
OFF E7
Indoor PCB / Display board communication error TS26
7 times
OFF EC
Refrigerant leak detected TS27
1 times
ON F0
Current overload protection TS28
2 times
ON F1
Outdoor room temperature sensor T4 is in open circuit or has short
circuited
TS25
3 times
ON F2
Condenser coil temperature sensor T3 is in open circuit or has short
circuited
TS25
4 times
ON F3
Compressor discharge temperature sensor TP is in open circuit or has
short circuited
TS25
5 times
ON F4
Outdoor unit EEPROM parameter error TS18
6 times
ON F5
The outdoor fan speed is operating outside of the normal range(for
some models)
TS22
1 times
FLASH P0
IPM malfunction or IGBT over-strong current protection TS29
2 times
FLASH P1
Over voltage or over low voltage protection TS30
3 times
FLASH P2
High temperature protection of IPM module TS31
5 times
FLASH P4
Inverter compressor drive error TS32
For other errors:
The display board may show a garbled code or a code undefined by the service manual. Ensure that this code is not a
temperature reading.
Troubleshooting:
Test the unit using the remote control. If the unit does not respond to the remote, the indoor PCB requires replacement.
If the unit responds, the display board requires replacement.