Service Manual

 Troubleshooting 5 
2.2 Error Display (For 18K And Above 18K Outdoor Unit)
There are 2 LED lights (RED color and GREEN color) welded in outdoor main board. After power on, LED show different
actions when encounter different problems.
No. Problem LED(GREEN) LED(RED) Solution
1 Standby normally
ON OFF -
2 Operate normally
OFF ON -
3 Compressor driven chip EEPROM parameter error
ON FLASH
TS18
4 IPM malfunction or IGBT over-strong current protection
Flash OFF
TS29
5 Over voltage or too low voltage protection
ON ON
TS30
6 Inverter compressor drive error
OFF FLASH
TS32
7 Inverter compressor drive error
Flash LIGHT
TS32
8
Communication error between outdoor main chip and
compressor driven chip
flash FLASH
TS18