Heat pumps · Error codes · Dimplex
BLK-DHWDimplex · WPM heat pump manager platform (error-code grouping)
BLK-DHW on a Dimplex WPM heat pump manager platform: Heat pump blocked: domestic hot water reheating via the 2nd heat generator is active
Short answer
On a Dimplex heat pump, BLK-DHW means: Heat pump blocked: domestic hot water reheating via the 2nd heat generator is active. The heat pump keeps running with some functions stopped.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Heat pump blocked: domestic hot water reheating via the 2nd heat generator is active.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Information only |
| Engineer needed? | No |
The heat pump keeps running with some functions stopped.
Resetting itself: Automatic when condition clears.
What you can check
- No action - informational.
What the engineer will check
The manual does not list the engineer’s checks for this code.
What you might notice
Sources
- Dimplex WPM EconPlus / WPM EconR heat pump manager - Operating instructions for users (Order no. 452114.66.57, FD 8902) ↗ · 452114.66.57 FD 8902 · page EN-14 (ManualsLib p.36) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026