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Heat pumps · Error codes · Stiebel Eltron
50008Stiebel Eltron · WPM heat pump manager / WPMsystem (controller platform)

50008 on a Stiebel Eltron WPM heat pump manager / WPMsystem: The HP type DIP switch of the IWS is set incorrectly

Short answer

On a Stiebel Eltron heat pump, 50008 means: The HP type DIP switch of the IWS is set incorrectly. 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: The HP type DIP switch of the IWS is set incorrectly.

Part involved: water flow / pump / booster heater.

When it shows: The HP type DIP switch of the IWS is set incorrectly.

Likely causes:

  • Disconnect the heat pump from the power supply and set the DIP switches correctly. Then carry out a reset of the heat pump.

Is it safe?

Does the heat pump stop?Yes
SeverityFault — 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: no.

Manual reset: yes - reset of heat pump via WPM after cause removed (contractor).

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

  • Disconnect the heat pump from the power supply and set the DIP switches correctly. Then carry out a reset of the heat pump.

Who to ask for: Heating / heat pump engineer.

What you might notice

Sources

A code explains what the controller detected, not a confirmed root cause.

Reviewed: 23 September 2026