How much does it cost to fix boiler error code 89?

Typical repair cost for the boiler 89 fault is £250-£450 including labour.

89 High

Boiler Fault Code 89

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 89 appears across 2 boiler brands and 14 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 an issue with its internal computer board or the electricity supply coming into your home, which has caused it to stop working. (As reported on Biasi Antares System)

Pick your boiler brand for the 89 fix

Alpha 89 10 models Biasi 89 4 models

Source

Information for the 89 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