H95 on a Dimplex LA MI inverter outdoor air-to-water: Supply voltage issue to the fridge (refrigerant) PCB
Short answer
On a Dimplex heat pump, H95 means: Supply voltage issue to the fridge (refrigerant) PCB. 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: Supply voltage issue to the fridge (refrigerant) PCB.
Part involved: Mains supply / noise filter PCB.
Likely causes:
- Insufficient power supply (UK 230V -6%/+10%, 216-253 V).
- Faulty outdoor PCB (noise filter/main).
- DC filter capacitor.
Is it safe?
Switch the heat pump off at its isolator and call an engineer.
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: unknown.
Manual reset: Clear via control panel per Dimplex article (method shown as image).
What you can check
- Note the code and contact the installer or Dimplex service.
What the engineer will check
- Isolate the heat pump from mains before any work.
- Measure supply voltage at consumer unit and unit.
- Check noise filter PCB and DC filter capacitor.
Who to ask for: heat pump service engineer / heating engineer.
Certification: Electrical competence (Part P / qualified electrician) for work inside control panels.
What you might notice
Sources
- GDHV Help Centre article: i have h95 error on my la mi heat pump what does this mean ↗ · GDHV article (modified 2023-02) · page n/a (web article) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026