BoilerFaultCodes F.161 High
Boiler Fault Code F.161
Also written as F161 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.161 appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's computer has detected an internal communication error and is unable to read its own memory, meaning the system cannot run correctly. (As reported on Viessmann Vitodens 100-W WB1A)
Pick your boiler brand for the F.161 fix
Source
Information for the F.161 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