BoilerFaultCodes 30 High
Boiler Fault Code 30
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 30 appears across 23 boiler brands and 79 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-W)
Pick your boiler brand for the 30 fix
Alpha 30 2 models Atmos 30 3 models Baxi 30 5 models British Gas 30 1 model Chaffoteaux 30 1 model Daikin 30 1 model ECA 30 1 model Ferroli 30 1 model Glow-worm 30 1 model Heatline 30 2 models Ideal 30 5 models Intergas 30 7 models Johnson Starley 30 5 models Main 30 2 models Potterton 30 2 models Ravenheat 30 6 models Remeha 30 1 model Saunier Duval 30 2 models Sime 30 1 model Unical 30 2 models Viessmann 30 21 models Vokera 30 6 models Worcester Bosch 30 1 model
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 31 August 2026