30514 on a Stiebel Eltron WPM heat pump manager / WPMsystem: A mechanical ventilation fan is not achieving its set flow rate

What it means

The manual says: A mechanical ventilation fan is not achieving its set flow rate.

Part involved: ventilation module / fans / air sensors.

When it shows: A mechanical ventilation fan is not achieving its set flow rate.

Likely causes:

• Ventilation duct blocked. Ventilation flaps closed. Ventilation system setup error. Remedy: Remove the blockage or open the ventilation flaps.

Is it safe?

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.
• Check the outdoor unit air intake/discharge is not blocked by leaves, snow or ice (air source units).

What the engineer will check

• Ventilation duct blocked. Ventilation flaps closed. Ventilation system setup error. Remedy: Remove the blockage or open the ventilation flaps.

Who to ask for: MVHR/ventilation-competent heat pump engineer.

What you might notice

• WPM display shows FAULT/message number (e.g. "FAULT WPM 30514")

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