How much does it cost to fix boiler error code AL 28?

Typical repair cost for the boiler AL 28 fault is £80-250 including labour.

AL 28 High

Boiler Fault Code AL 28

Also written as AL28 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code AL 28 appears across 1 boiler brand 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 been reset too many times in a short period and has temporarily locked itself for one hour as a safety precaution. (As reported on Sime Murelle Pro HE System R)

Pick your boiler brand for the AL 28 fix

Sime AL 28 14 models

Source

Information for the AL 28 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