50 High

Boiler Fault Code 50

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 50 appears across 10 boiler brands and 39 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 providing hot water because the internal sensor that measures water temperature has detected a technical fault or a short circuit. (As reported on Viessmann Vitodens 200)

Pick your boiler brand for the 50 fix

Atag 50 7 models Biasi 50 4 models Chaffoteaux 50 2 models Ferroli 50 2 models Halstead 50 8 models Ideal 50 2 models Potterton 50 1 model Viessmann 50 9 models Vokera 50 3 models Worcester Bosch 50 1 model

Source

Information for the 50 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 27 April 2026