How much does it cost to fix Baxi error code H.02 – .03?

Typical repair cost for the Baxi H.02 – .03 fault is £80-160 including labour.

H.02 – .03 High

Baxi H.02 – .03 Fault Code

Q: What does the Baxi H.02 – .03 fault code mean?

Your boiler is temporarily confused by its internal software settings and cannot start up correctly.

Also written as H0203 — same fault.

The Baxi H.02 – .03 fault code means: your boiler is temporarily confused by its internal software settings and cannot start up correctly.. It appears on 24 Baxi models in our database.

Technical description: Temporary error- incorrect configuration settings C1/C2.

What causes the Baxi H.02 – .03 fault?

This fault occurs when the boiler's internal computer becomes confused about which specific model it is supposed to be. It is usually caused by a glitch in the software or a communication error between the electronic components after a power surge or a component failure. Because the boiler cannot confirm its own identity and safety parameters, it shuts down as a protective measure.

Typical repair cost £80-160 (including labour)

DIY fix possible

Locate the selector switch or reset button on the front of the boiler.Turn the switch to the 'R' (Reset) position and hold for at least 5 seconds.Wait for the boiler to restart; if the code repeats, a Gas Safe engineer must reconfigure the internal board.

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Baxi models that show the H.02 – .03 fault code

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

Source

Baxi H.02 – .03 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 27 April 2026