Temporary-stop-of-compressor-operation on a Worcester Bosch Greensource air to water heat pump: Info window: Temporary stop of compressor operation
Short answer
On a Worcester Bosch heat pump, Temporary-stop-of-compressor-operation means: Info window: Temporary stop of compressor operation. 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: Info window: Temporary stop of compressor operation.
Part involved: operating envelope (T2/T6).
When it shows: T2 below lowest envelope (e.g. outside below -20 C); T6 above envelope stop; excessive evaporation/condensing differential; low refrigerant level. Compressor stops and additional heater starts.
Likely causes:
- T2 below lowest envelope (e.g. outside below -20 C); T6 above envelope stop; excessive evaporation/condensing differential; low refrigerant level. Compressor stops and additional heater starts.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Information only |
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Resetting itself: yes.
Manual reset: Clears automatically; warnings may be acknowledged.
What you can check
- Read and note the full alarm text shown on the controller and pass it to your installer.
What the engineer will check
- Check refrigerant if recurrent outside cold-weather conditions.
Who to ask for: F-gas refrigeration engineer / heat pump installer.
Certification: F-gas certification (Category I) required for refrigerant circuit work; qualified electrician for electrical work.
What you might notice
Sources
- Installation Manual Air to Water Heat Pump with DHW distribution unit Greensource 6/7/9.5 kW ↗ · 6 720 641 467 (2010/01) · page 44-45 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026