TradeAssistIQHome

LG Therma V fault CH09

PCB program (EEPROM) fault

Heat pump

What it means

A defect occurred in the optional EEPROM connected to the Main PCB(Indoor). If the EEPROM value and the Program value do not match, the code is displayed.

Likely causes

  1. Optional EEPROM is loosely inserted or removed
  2. Optional EEPROM burnout

Where to start

  1. Check if the Option PCB is correctly plugged into Main PCB(Indoor). If No, re-insert the Option PCB.
  2. If Option PCB is correctly plugged, check if the EEPROM is in a normal state (no dents, burn marks, or other visible defects on the exterior). If No, replace the EEPROM.
  3. If EEPROM is in normal state, check if the EEPROM insertion direction is correct (check groove direction). If No, change the direction of EEPROM.

The full answer, free

  • 1 more check in order
  • How to put it right, step by step
  • The manual page for this fault (page 84), right under the answer
Ask about CH09 freeCreate a free account

Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.

From the LG manual for the Therma V. Check the model on the data plate before you order parts.

Other LG Therma V fault codes