How much does it cost to fix boiler error code Over-run?

Typical repair cost for the boiler Over-run fault is £120-250 including labour.

Over-run Medium

Boiler Fault Code Over-run

Also written as OVERRUN — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code Over-run appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is currently cooling itself down after getting too hot by running its internal pump to circulate water until the temperature drops. (As reported on Firebird Envirogreen)

Pick your boiler brand for the Over-run fix

Firebird Over-run 1 model

Source

Information for the Over-run fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026