BoilerFaultCodesBaxi Overheat Fault Code
Also written as OVERHEAT — same fault.
The Baxi Overheat fault code means: your boiler has detected that it is running too hot and has automatically switched itself off as a safety precaution to prevent damage.. It appears on 3 Baxi models in our database.
Technical description: The overheat indicator light will be illuminated if the appliance needs resetting. Shuts down the appliance should the system overheat.
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 Overheat fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi Overheat 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