How much does it cost to fix Firebird error code High limit?

Typical repair cost for the Firebird High limit fault is £120-350 including labour.

High limit High

Firebird High limit Fault Code

Q: What does the Firebird High limit fault code mean?

Your boiler has reached an unsafe temperature and has automatically shut down to prevent damage or dangerous overheating.

Also written as HIGHLIMIT — same fault.

The Firebird High limit fault code means: your boiler has reached an unsafe temperature and has automatically shut down to prevent damage or dangerous overheating.. It appears on 3 Firebird models in our database.

Technical description: temperature in boiler overheats.

Typical repair cost £120-350 (including labour)

DIY fix possible

Check that all radiator valves are open and not turned off.Ensure there is enough water pressure in the system by checking the pressure gauge.Press the manual reset button located on the control panel or behind the front cover.

Find a Gas Safe engineer

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

Gas Safe Register →

Firebird models that show the High limit fault code

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

Source

Firebird High limit 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