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Heat pumps · Error codes · Baxi
bHBaxi · HP40 / Baxi Assure HP50 Monobloc ASHP

bH on a Baxi HP40 / Baxi Assure HP50 Monobloc ASHP: PED PCB failure

Short answer

On a Baxi heat pump, bH means: PED PCB failure. 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: PED PCB failure.

Part involved: inverter module, compressor, PFC.

Likely causes:

  • After 5 minutes power-off, power on again; if not restored replace PED safety board; if still not recovered replace IPM module board.

Is it safe?

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: Installer: correct cause then power OFF/ON (ISM 13.4).

What you can check

  • Note the exact code shown on the controller and when it appeared.
  • Check the outdoor unit is not blocked by leaves, debris, snow or covers and has clear airflow.
  • Check the heat pump's consumer-unit breaker / isolator is on (do not open any panels).
  • If the code persists or returns, contact a heat pump engineer.

What the engineer will check

  • After 5 minutes power-off, power on again; if not restored replace PED safety board; if still not recovered replace IPM module board.

Who to ask for: heat pump engineer with electrical competence.

Certification: Qualified electrician / manufacturer-trained heat pump engineer; F-gas if refrigerant circuit is opened.

What you might notice

Sources

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

Reviewed: 23 September 2026