30475 on a Stiebel Eltron WPM heat pump manager / WPMsystem: Sensor value of the "water pressure sensor" outside the permissible range
Short answer
On a Stiebel Eltron heat pump, 30475 means: Sensor value of the "water pressure sensor" outside the permissible range. 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: Sensor value of the "water pressure sensor" outside the permissible range.
Part involved: temperature/pressure sensor.
When it shows: Sensor value of the "water pressure sensor" outside the permissible range.
Likely causes:
- Check sensor, lead and relevant plug-in connectors. Replace if faulty.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Warning |
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Resetting itself: unknown.
Manual reset: unknown.
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
- Check sensor, lead and relevant plug-in connectors. Replace if faulty.
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
- WPM notification list (WPM V2.9) - multilingual; English section pp.15-26 (DOC-00081866) ↗ · WPM V2.9 · page 25 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026