How much does it cost to fix boiler error code AL20?

Typical repair cost for the boiler AL20 fault is £90-180 including labour.

AL20 High

Boiler Fault Code AL20

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code AL20 appears across 1 boiler brand and 8 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has shut down because its internal safety sensor has detected that the water temperature has risen too high. (As reported on Vokera Mynute Vhe)

Pick your boiler brand for the AL20 fix

Vokera AL20 8 models

Source

Information for the AL20 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