BoilerFaultCodes AL52 High
Boiler Fault Code AL52
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AL52 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's internal computer has encountered a memory or software error and can no longer control the heating properly. (As reported on Vokera Unica HE)
Pick your boiler brand for the AL52 fix
Source
Information for the AL52 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