Overheat indicator High

Baxi Overheat indicator Fault Code

Also written as OVERHEATINDICATOR — same fault.

The Baxi Overheat indicator fault code means: your boiler has switched itself off because it has become too hot internally, often due to a temporary blockage or a circulation issue.. It appears on 5 Baxi models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: The overheat indicator is lit. Press the white Reset Button.
Typical repair cost £100-£250 (including labour)

DIY fix possible

Check that your radiator valves are openEnsure there is enough water pressure in the system (usually 1.0 to 1.5 bar)Press the white Reset button on the front control panel

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Baxi models that show the Overheat indicator fault code

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

Source

Baxi Overheat indicator 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