Boiler On Low

Baxi Boiler On Fault Code

Also written as BOILERON — same fault.

The Baxi Boiler On fault code means: your boiler is operating normally and is currently receiving a signal to provide heating or hot water, meaning no faults are present.. It appears on 4 Baxi models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Indicator light showing mains voltage at P/L input and fuse health; should be on if external controls call for heat.

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 Boiler On fault code

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

Source

Baxi Boiler On 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