How much does it cost to fix boiler error code 94?

Typical repair cost for the boiler 94 fault is £120-200 including labour.

94 High

Boiler Fault Code 94

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 94 appears across 6 boiler brands and 18 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 detect that it is safely draining away the water created during the heating process, causing it to stop working to prevent internal damage. (As reported on Vokera Linea HE)

Pick your boiler brand for the 94 fix

Alpha 94 6 models Evo 94 1 model Ideal 94 2 models Keston 94 1 model Viessmann 94 5 models Vokera 94 3 models

Source

Information for the 94 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