SAFETY HIGH LIMIT THERMOSTAT High

Firebird SAFETY HIGH LIMIT THERMOSTAT Fault Code

Q: What does the Firebird SAFETY HIGH LIMIT THERMOSTAT fault code mean?

Your boiler has switched itself off because it got too hot, acting as a safety measure to prevent damage.

Q: How much does it cost to fix Firebird error code SAFETY HIGH LIMIT THERMOSTAT?

Typical repair cost for the Firebird SAFETY HIGH LIMIT THERMOSTAT fault is £90-180 including labour.

Also written as SAFETYHIGHLIMITTHERMOSTAT — same fault.

The Firebird SAFETY HIGH LIMIT THERMOSTAT fault code means: your boiler has switched itself off because it got too hot, acting as a safety measure to prevent damage.. It appears on 2 Firebird models in our database.

Technical description: Fixed at 110˚C, this system protects the boiler in the event of the control thermostat failing. It will shut the boiler off and require the limit button to be pushed to restart.

Typical repair cost £90-180 (including labour)

DIY fix possible

Wait for the boiler to cool down completely (at least 20-30 minutes).Locate the manual reset button for the high limit thermostat, usually found under a black screw cap on the control panel.Unscrew the cap and firmly press the small reset button inside.Restart the boiler and check that your radiator valves are open and the pump is running.

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Firebird models that show the SAFETY HIGH LIMIT THERMOSTAT fault code

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

Source

Firebird SAFETY HIGH LIMIT THERMOSTAT fault code information on this page is sourced and cross-checked against the official Firebird service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026