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

Typical repair cost for the boiler 94 fault is £120-190 including labour.

94 Medium

Boiler Fault Code 94

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code 94 appears across 6 boiler brands and 15 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 a problem with the sensor that measures the water temperature in your solar cylinder, which may affect how your hot water is heated. (As reported on Viessmann Vitodens 333-F)

Pick your boiler brand for the 94 fix

Alpha 94 4 models Evo 94 1 model Ideal 94 2 models Keston 94 1 model Viessmann 94 6 models Vokera 94 1 model

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 31 August 2026