F19 on a Dimplex WPM heat pump manager platform: Primary circuit: fault caused by primary pump or fan motor protection
Short answer
On a Dimplex heat pump, F19 means: Primary circuit: fault caused by primary pump or fan motor protection. 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: Primary circuit: fault caused by primary pump or fan motor protection.
Part involved: Brine/well primary pump (GSHP/WSHP) or fan motor protection (ASHP).
Likely causes:
- Primary pump fault.
- Fan motor protection tripped.
- Obstructed air flow around air source unit (GDHV).
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: After rectifying the fault the heat pump can be restarted; switching off the control voltage also acknowledges the fault (WPM Touch p.54). On text-display WPMs press Esc to acknowledge (EconPlus EN-16).
Manual reset: Acknowledge after rectification.
What you can check
- Air source: check the outdoor unit is not blocked by leaves, snow, bushes or branches and required clearances are free.
- Note the fault code, the heat pump model (type plate) and controller software version shown in operating data, and contact the installer/Dimplex service.
What the engineer will check
- Check primary pump / fan motor protection setting and function.
Who to ask for: heat pump service engineer.
Certification: Electrical competence (Part P / qualified electrician) for work inside control panels.
What you might notice
Sources
- Dimplex WPM Touch heat pump manager - Operating instructions for users and specialists (Order no. 452117.66.02-EN, WPM3.13 / Display 1.15) ↗ · 452117.66.02-EN FD 0302 · page 55 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026