H.02 .05 High

Baxi H.02 .05 Fault Code

Also written as H0205 — same fault.

The Baxi H.02 .05 fault code means: your boiler's internal computer is experiencing a conflict between its settings and its main control board, which has caused it to stop working for safety reasons.. It appears on 7 Baxi models 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: Setting memory not compatible with the boiler PCB type Reset CN codes. Replace main PCB
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 H.02 .05 fault code

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

Source

Baxi H.02 .05 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