F73 High

Boiler Fault Code F73

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code F73 appears across 2 boiler brands and 8 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 accurately measure the water pressure inside the system, which is preventing it from safely starting up your heating. (As reported on Heatline Capriz Plus)

Pick your boiler brand for the F73 fix

Glow-worm F73 1 model Heatline F73 7 models

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 7 July 2026