How much does it cost to fix boiler error code A09-12?

Typical repair cost for the boiler A09-12 fault is £350-£550 including labour.

A09-12 High

Boiler Fault Code A09-12

Also written as A0912 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code A09-12 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's main internal computer has developed a serious communication fault and can no longer control the heating process safely. (As reported on Potterton Powermax HE)

Pick your boiler brand for the A09-12 fix

Potterton A09-12 1 model

Source

Information for the A09-12 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