BoilerFaultCodes F73 High
Boiler Fault Code F73
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F73 appears across 2 boiler brands and 17 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling to read its own water level because of an electrical sensor issue, which has caused it to stop working as a safety precaution. (As reported on Glow-worm Ultracom 24cx 30cx)
Pick your boiler brand for the F73 fix
Source
Information for the F73 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