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

Typical repair cost for the boiler ALL 89 fault is £150-300 including labour.

ALL 89 High

Boiler Fault Code ALL 89

Also written as ALL89 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code ALL 89 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to maintain a stable flame because it cannot correctly detect the quality of the combustion process, causing it to shut down for safety. (As reported on Sime Brava Slim HE Regular)

Pick your boiler brand for the ALL 89 fix

Sime ALL 89 3 models

Source

Information for the ALL 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 7 July 2026