PCB Fault High

Baxi PCB Fault Fault Code

Also written as PCBFAULT — same fault.

The Baxi PCB Fault fault code means: your boiler's internal computer brain has detected an electronic error and has stopped working to protect the system.. It appears on 1 Baxi model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Indicator: Upper LED Flash, Middle LED On, Lower LED Flash, Bottom LED Off.
Typical repair cost £250-450 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Baxi models that show the PCB Fault fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Baxi PCB Fault fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026