BoilerFaultCodes F 04 High
Boiler Fault Code F 04
Also written as F04 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F 04 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 temperature sensor is providing incorrect information, causing the system to stop working as a safety precaution since it cannot accurately regulate how hot the water is. (As reported on Ideal Logic+ Heat)
Pick your boiler brand for the F 04 fix
Source
Information for the F 04 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