LG Therma V fault CH60

What it means

EEPROM access error and Check SUM error on the outdoor unit. Indicates the EEPROM on the Main PCB (Outdoor Inv) or Inv PCB (Outdoor) cannot be read correctly or data integrity check has failed.

Likely causes

1. Bad EEPROM contact / wrong insertion
2. EEPROM version is different
3. Outdoor unit PCB failure
4. Fan locked
5. Obstruction/shield around the heat exchanger
6. Insufficient distance between product and wall
7. Piping condition issues such as pipe bending
8. EEV operation/connection status fault
9. Abnormal refrigerant pressure
10. Compressor restraint
11. Compressor wiring reverse phase loss
12. Short circuit or opening of internal connection line in compressor
13. Compressor winding resistance out of spec
14. Compressor insulation resistance failure
15. Inverter PCB assembly or connector connection fault
16. IGBTM failure

Where to start

1. Check if EEPROM is inserted. If not inserted, check connection status and reinsert.
2. If EEPROM is inserted, check if EEPROM status is normal. If not normal, replace EEPROM.
3. If EEPROM status is normal, check if EEPROM insertion direction is normal (insert the socket hole and EEPROM hole in the same direction). If not normal, change EEPROM direction.