BoilerFaultCodes AL 98 High
Boiler Fault Code AL 98
Also written as AL98 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AL 98 appears across 1 boiler brand and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has encountered a digital communication error while trying to start up following a power reset or internal check. (As reported on Sime Murelle Pro HE R MkII System)
Pick your boiler brand for the AL 98 fix
Source
Information for the AL 98 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