How much does it cost to fix boiler error code 59?

Typical repair cost for the boiler 59 fault is £120-£200 including labour.

59 High

Boiler Fault Code 59

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 59 appears across 5 boiler brands and 22 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped working because it cannot accurately measure the temperature of the water leaving the unit, usually due to a fault in a sensor or its wiring. (As reported on Viessmann Vitodens 050-W)

Pick your boiler brand for the 59 fix

Alpha 59 6 models Baxi 59 1 model Gledhill 59 1 model Sime 59 4 models Viessmann 59 10 models

Source

Information for the 59 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