BoilerFaultCodes 30 High
Boiler Fault Code 30
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 30 appears across 29 boiler brands and 93 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 3 models Atag 30 1 model Atmos 30 4 models Baxi 30 7 models British Gas 30 1 model Chaffoteaux 30 2 models Daikin 30 2 models ECA 30 1 model Ferroli 30 4 models Gledhill 30 1 model Glow-worm 30 1 model Heatline 30 3 models Ideal 30 5 models Intergas 30 11 models Johnson Starley 30 5 models Main 30 2 models Malvern 30 1 model Navien 30 1 model Potterton 30 3 models Ravenheat 30 6 models Remeha 30 2 models Saunier Duval 30 3 models Servowarm 30 1 model Sime 30 1 model Unical 30 2 models Viessmann 30 12 models Vokera 30 6 models Warmworld 30 1 model 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 7 July 2026