30 High

Boiler Fault Code 30

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 30 appears across 13 boiler brands and 58 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 heating because a internal sensor that monitors water temperature has developed an electrical fault and is preventing the burner from firing. (As reported on Viessmann Vitodens 200)

Pick your boiler brand for the 30 fix

Alpha 30 1 model Atag 30 1 model Chaffoteaux 30 3 models Ferroli 30 3 models Glow-worm 30 1 model Ideal 30 2 models Intergas 30 10 models Johnson Starley 30 10 models Ravenheat 30 8 models Remeha 30 2 models Saunier Duval 30 4 models Viessmann 30 9 models Vokera 30 4 models

Source

Information for the 30 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