How much does it cost to fix boiler error code E28?

Typical repair cost for the boiler E28 fault is £100-£180 including labour.

E28 High

Boiler Fault Code E28

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code E28 appears across 8 boiler brands and 67 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected a problem with the internal sensor that monitors the temperature of the exhaust gases, causing the system to shut down for safety. (As reported on Baxi 600 Combi (range))

Pick your boiler brand for the E28 fix

Atag E28 1 model Baxi E28 37 models Biasi E28 2 models Halstead E28 6 models Johnson Starley E28 1 model Main E28 5 models Potterton E28 13 models Vokera E28 2 models

Source

Information for the E28 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