BoilerFaultCodes 98:1 Low
Boiler Fault Code 98:1
Also written as 981 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 98:1 appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is experiencing a communication error with an external remote monitoring system, meaning the central hub cannot correctly read your heating data. (As reported on Viessmann Vitodens 200)
Pick your boiler brand for the 98:1 fix
Source
Information for the 98:1 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