BoilerFaultCodes F61 – A61 High
Boiler Fault Code F61 – A61
Also written as F61A61 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F61 – A61 appears across 1 boiler brand 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's main internal computer has developed a communication fault and can no longer control the heating process safely. (As reported on Ferroli iBoiler 28)
Pick your boiler brand for the F61 – A61 fix
Source
Information for the F61 – A61 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