BoilerFaultCodes 7-7 High
Boiler Fault Code 7-7
Also written as 77 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 7-7 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 has detected a faulty internal temperature sensor, meaning the system cannot safely monitor its own heat levels and has shut down as a precaution. (As reported on Ideal Logic Air)
Pick your boiler brand for the 7-7 fix
Source
Information for the 7-7 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