Boiler Fault Code F.576

Also written as F576 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026

Fault code F.576 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to accurately detect the temperature inside your home, so it has decided to ignore your wall thermostat and run based on its internal settings instead. (As reported on Viessmann Vitodens 222-F B2TF)