BoilerFaultCodesBaxi H.03.02 Fault Code
Also written as H0302 — same fault.
The Baxi H.03.02 fault code means: your boiler has briefly lost its flame, but it is likely attempting to restart itself automatically; if it stays off, it indicates a recurring issue with the ignition or gas supply.. It appears on 8 Baxi models in our database.
Technical description: Temporary flame loss ELECTRODE PROBLEM Check the electrode connection and wiring Check the condition of the electrode GAS SUPPLY Check the gas supply pressure Check the gas valve calibration FLUE GAS PIPES Check the pipes and the termina
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.03.02 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi H.03.02 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