SUPERHEATING-INV-V-ND on a Stiebel Eltron WPM 3 heat pump manager: Temperature limiter for inverter of low pressure compressor has been triggered
Short answer
On a Stiebel Eltron heat pump, SUPERHEATING-INV-V-ND means: Temperature limiter for inverter of low pressure compressor has been triggered. 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: Temperature limiter for inverter of low pressure compressor has been triggered.
Part involved: compressor or fan inverter.
When it shows: Temperature limiter for inverter of low pressure compressor has been triggered.
Likely causes:
- Value is reset automatically. If necessary, clean the inverter heat sink.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: yes - restarts after IWS fault time/idle time.
Manual reset: after 5 faults in 2 h run: IWS reset.
What you can check
- Read and note the full message code and time from the WPM display (DIAGNOSIS / NOTIFICATIONLIST if accessible without a code).
- Check the heat pump and controller circuit breakers/isolators at the consumer unit are on.
- Check the heating system pressure gauge reading is in the normal range stated by your installer.
What the engineer will check
- Value is reset automatically. If necessary, clean the inverter heat sink.
Who to ask for: Heat pump service engineer (electrical/controls).
Certification: Qualified electrician competence for live-work on appliance electrics.
What you might notice
Sources
- OPERATION AND INSTALLATION Heat pump manager WPM 3 (DM0000035521) ↗ · A 316199-43934-9674 · page 50 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026