CH88 on a LG heat pump: PFC (inverter PCBA) EEPROM error – communication fail between PFC micom and its EEPROM
Short answer
On a LG heat pump, CH88 means: PFC (inverter PCBA) EEPROM error – communication fail between PFC micom and its EEPROM. The heat pump keeps running with some functions stopped. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: PFC (inverter PCBA) EEPROM error – communication fail between PFC micom and its EEPROM.
Part involved: inverter PCB PFC EEPROM.
When it shows: EEPROM check fails.
Likely causes:
- PFC EEPROM missing/omitted or faulty; PCB fault.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Resetting itself: yes – trouble clears when the condition is repaired; emergency operation must be restarted by the user after a power reset.
Manual reset: Not normally required; user restarts after power reset if emergency operation was running.
What you can check
- Read the code on the controller (LG shows 'CH' + number; older wired controllers alternate 'CH' and the number) and note it together with the model number. Report it to your installer or an LG-authorised service centre – LG owner's manuals say an error code generated by self-diagnosis is a reason to call the service. For this 'trouble' class LG allows temporary emergency operation: if the controller shows a pop-up offering it you may accept (OK) as a stop-gap; running costs will be higher, so do not use it long term. Emergency operation does not restart by itself after a power cut – you must switch it back on at the controller. Check (without opening any panels) that the outdoor unit is not blocked by leaves, debris, snow or ice and that nothing is stacked against the coil or fan grille.
What the engineer will check
- Check/replace EEPROM or inverter PCB.
Who to ask for: Heat pump engineer (controls, sensors, PCB).
Certification: None statutory beyond electrical competence (BS 7671).
What you might notice
Sources
- LG THERMA V R290 Monobloc Installation Manual (HM..HF UB60 / UB40, PHCS0), MFL68681848 Rev.03 (2024) – ManualsLib 3668662 ↗ · MFL68681848 Rev.03_112224 · page 183 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026