How much does it cost to fix Baxi error code Safety Thermostat?

Typical repair cost for the Baxi Safety Thermostat fault is £90-220 including labour.

Safety Thermostat High

Baxi Safety Thermostat Fault Code

Q: What does the Baxi Safety Thermostat fault code mean?

Your boiler has shut down because it has detected it is getting too hot, usually due to a lack of water flow or a circulation blockage.

Also written as SAFETYTHERMOSTAT — same fault.

The Baxi Safety Thermostat fault code means: your boiler has shut down because it has detected it is getting too hot, usually due to a lack of water flow or a circulation blockage.. It appears on 1 Baxi model in our database.

Technical description: The safety thermostat neon will light in the event of the system or the boiler overheating.

Typical repair cost £90-220 (including labour)

DIY fix possible

Check that your radiator valves are open to allow water to flow.Check the central heating pressure gauge is between 1 and 1.5 bar; top up if low.Turn the selector switch to the reset position for five seconds, then back to the desired setting.

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Baxi models that show the Safety Thermostat fault code

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

Bahama 80e / 105e Repair: £90-220

Source

Baxi Safety Thermostat 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