How much does it cost to fix boiler error code F.012?

Typical repair cost for the boiler F.012 fault is £120-200 including labour.

F.012 High

Boiler Fault Code F.012

Also written as F012 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code F.012 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is having trouble reading the temperature of your hot water, which means it has stopped providing hot water to your taps to prevent the system from overheating. (As reported on Vaillant ecoTEC Plus 832)

Pick your boiler brand for the F.012 fix

Vaillant F.012 3 models

Source

Information for the F.012 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