How much does it cost to fix boiler error code F44?

Typical repair cost for the boiler F44 fault is £100-180 including labour.

F44 High

Boiler Fault Code F44

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code F44 appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's internal thermometer that monitors the water returning from your radiators has developed a fault, preventing the system from heating up correctly. (As reported on Ferroli Optimax)

Pick your boiler brand for the F44 fix

Ferroli F44 4 models

Source

Information for the F44 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 27 April 2026