28 Medium

Boiler Fault Code 28

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 28 appears across 13 boiler brands and 47 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 1 model Ariston 28 4 models Atag 28 1 model Baxi 28 6 models Glow-worm 28 1 model Ideal 28 3 models Main 28 3 models Potterton 28 5 models Ravenheat 28 8 models Remeha 28 2 models Viessmann 28 9 models Vokera 28 3 models Worcester Bosch 28 1 model

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 27 April 2026