BoilerFaultCodes A98 Emergency
Boiler Fault Code A98
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code A98 appears across 2 boiler brands and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected an internal electronic communication failure, meaning the safety systems cannot properly monitor its operation. (As reported on Ariston ACO 27 MFFI)
Pick your boiler brand for the A98 fix
Source
Information for the A98 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 31 August 2026