How much does it cost to fix Baxi error code CH Fault?

Typical repair cost for the Baxi CH Fault fault is £120-350 including labour.

CH Fault Medium

Baxi CH Fault Fault Code

Q: What does the Baxi CH Fault fault code mean?

Your boiler has encountered a problem specifically with the central heating operation, meaning your radiators likely won't heat up even though your hot water might still work.

Also written as CHFAULT — same fault.

The Baxi CH Fault fault code means: your boiler has encountered a problem specifically with the central heating operation, meaning your radiators likely won't heat up even though your hot water might still work.. It appears on 3 Baxi models in our database.

Technical description: LED 1: Off, LED 2: On, LED 3: Flash, LED 4: On (Go to CH Fault section of the fault finding instructions)

Typical repair cost £120-350 (including labour)

DIY fix possible

Check that your room thermostat or heating programmer is turned up and calling for heatEnsure all radiator valves (TRVs) are open and not stuck in the closed positionReset the boiler by turning the selector switch to the 'R' position for at least 5 seconds

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Baxi models that show the CH Fault fault code

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

Source

Baxi CH 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 27 April 2026