How much does it cost to fix boiler error code AL73?

Typical repair cost for the boiler AL73 fault is £90-160 including labour.

AL73 High

Boiler Fault Code AL73

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code AL73 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 stopped working because it cannot correctly measure the temperature of the water coming back from your radiators. (As reported on Vokera Syntesi E)

Pick your boiler brand for the AL73 fix

Vokera AL73 8 models

Source

Information for the AL73 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