CH63 on a LG THERMA V Monobloc: Condenser-pipe temperature too low – R410A Monobloc
Short answer
On a LG heat pump, CH63 means: Condenser-pipe temperature too low – R410A Monobloc. 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: Condenser-pipe temperature too low – R410A Monobloc.
Part involved: condenser pipe / plate heat exchanger.
When it shows: Condenser pipe temperature below limit.
Likely causes:
- Low condenser pipe temperature (e.g. cooling/defrost with low water temperature, low flow).
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. Look at the system pressure gauge and tell the engineer what it reads (LG commissioning guidance is roughly 1.5–2.5 bar when cold); do not top up or bleed the system yourself unless your installer has shown you how, and make sure any filling loop is closed.
What the engineer will check
- Check water flow and return temperature, defrost operation, sensor.
Who to ask for: Heat pump engineer with LG Therma V training; F-gas certified refrigeration engineer for refrigerant-circuit work.
Certification: F-gas certification (UK F-gas Regulation, Category I) for any refrigerant handling on R32/R410A units; for R290 units additionally competence in flammable (hydrocarbon) refrigerants (e.g. BESA/ACRIB HC safe handling).
What you might notice
What owners and engineers report
2 owner and engineer reports mention this.
- Keeps stopping / cutting out on the THERMA V Monobloc (R410A): 1 report
- No heating on the THERMA V Monobloc (R410A): 1 report
Sources
- LG Therma V AHBW A0 Series Service Manual (R410A Monobloc AHBW036H0, AHBW056A0…AHBW168A0), P/No. MFL58346405 (April 2013) – ManualsLib 3030181 ↗ · P/No. MFL58346405 · page 48 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026