E2X.F11 on a Worcester Bosch Greenstore LECP ground source heat pump: Motor cut-out 1 E2X.F11, compressor
Short answer
On a Worcester Bosch heat pump, E2X.F11 means: Motor cut-out 1 E2X.F11, compressor. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Motor cut-out 1 E2X.F11, compressor.
Part involved: compressor motor cut-out / soft starter.
When it shows: Motor cut-out tripped due to high current or lost phase; may also be soft starter alarm.
Likely causes:
- Motor cut-out tripped due to high current or lost phase; may also be soft starter alarm.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: no.
Manual reset: Reset motor cut-out / correct soft starter alarm.
What you can check
- Read and note the full alarm text and category letter shown on the controller and pass it to your installer.
- Check the heat pump isolator and consumer-unit breaker(s) are switched on; if a breaker has tripped more than once, leave it off and call an engineer.
What the engineer will check
- Diagnose per chapter 21: Motor cut-out tripped due to high current or lost phase; may also be soft starter alarm.
Who to ask for: heat pump installer / electrician.
Certification: Electrical work to BS 7671 by competent person.
What you might notice
Sources
- Installation, Commissioning and Servicing Instructions Worcester Greenstore LECP GSHP (System/Combi 6-11 kW) ↗ · 6 720 806 768 (2013/02) · page 60 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026