Heat pumps · Error codes · Worcester Bosch
E41.F31Worcester Bosch · Greenstore LECP ground source heat pump (System & Combi)
E41.F31 on a Worcester Bosch Greenstore LECP ground source heat pump: Faulty protective anode E41.F31
Short answer
On a Worcester Bosch heat pump, E41.F31 means: Faulty protective anode E41.F31. The heat pump keeps running. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Faulty protective anode E41.F31.
Part involved: protective anode.
When it shows: Anode broken/not working (only if protective anode installed).
Likely causes:
- Anode broken/not working (only if protective anode installed).
Is it safe?
| Does the heat pump stop? | No |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The heat pump keeps running.
Resetting itself: no.
Manual reset: Acknowledgement required.
What you can check
- Read and note the full alarm text and category letter shown on the controller and pass it to your installer.
- Acknowledge the alarm on the control unit once (the manual allows acknowledgement); if it recurs call the installer.
What the engineer will check
- Diagnose per chapter 21: Anode broken/not working (only if protective anode installed).
Who to ask for: heat pump installer / heating engineer.
Certification: None specific for hydraulic checks; MCS-certified installer recommended for system changes.
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