BoilerFaultCodes 28 Medium
Boiler Fault Code 28
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 28 appears across 18 boiler brands and 96 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's hot water sensor has stopped working correctly, which means you may have inconsistent or no hot water. (As reported on Potterton Performa 30 HE)
Pick your boiler brand for the 28 fix
Alpha 28 3 models Ariston 28 4 models Atag 28 6 models Baxi 28 22 models Daikin 28 1 model ECA 28 1 model Gledhill 28 1 model Glow-worm 28 1 model Ideal 28 5 models Main 28 10 models Potterton 28 12 models Ravenheat 28 7 models Remeha 28 2 models Sime 28 2 models Unical 28 2 models Viessmann 28 9 models Vokera 28 5 models Worcester Bosch 28 3 models
Source
Information for the 28 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