128 High

Boiler Fault Code 128

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 128 appears across 5 boiler brands and 20 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has attempted to start but failed to detect a flame, causing it to stop operating to ensure your safety. (As reported on Baxi EcoBlue System)

Pick your boiler brand for the 128 fix

Baxi 128 12 models ECA 128 1 model Main 128 3 models Potterton 128 3 models Worcester Bosch 128 1 model

Source

Information for the 128 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