How much does it cost to fix boiler error code F.72?

Typical repair cost for the boiler F.72 fault is £120-£220 including labour.

F.72 High

Boiler Fault Code F.72

Also written as F72 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code F.72 appears across 3 boiler brands and 56 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 that the two pipes measuring temperature are giving very different readings, which usually means a sensor is failing or there is a blockage in the system. (As reported on Vaillant ecoTEC pro)

Pick your boiler brand for the F.72 fix

Glow-worm F.72 24 models Vaillant F.72 29 models Viessmann F.72 3 models

Source

Information for the F.72 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 31 August 2026