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

Typical repair cost for the boiler AC fault is £120-450 including labour.

AC High

Boiler Fault Code AC

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code AC appears across 2 boiler brands and 19 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has lost communication between its internal computer and a key electrical sensor or motor, meaning it cannot operate safely. (As reported on Worcester Bosch WR325 RSF)

Pick your boiler brand for the AC fix

British Gas AC 2 models Worcester Bosch AC 17 models

Source

Information for the AC 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 31 August 2026