E2X.T8-info on a Worcester Bosch Greenstore LECP ground source heat pump: High flow temperature E2X.T8
Short answer
On a Worcester Bosch heat pump, E2X.T8-info means: High flow temperature E2X.T8. 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: High flow temperature E2X.T8.
Part involved: T8 flow.
When it shows: T8 exceeds maximum permitted; compressor stops; restarts when T9 falls 3 K.
Likely causes:
- T8 exceeds maximum permitted; compressor stops; restarts when T9 falls 3 K.
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: Automatic.
What you can check
- Read and note the full alarm text and category letter shown on the controller and pass it to your installer.
What the engineer will check
- Diagnose per chapter 21: T8 exceeds maximum permitted; compressor stops; restarts when T9 falls 3 K.
Who to ask for: heat pump installer / heating engineer.
Certification: None specific for hydraulic checks; MCS-certified installer recommended for system changes.
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 63 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026