Boiler Fault Code F.324

Also written as F324 — same fault.

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

Fault code F.324 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 has lost the electrical connection needed to keep its internal water pump running, so it has safely shut down to prevent overheating. (As reported on Vaillant ecoTEC plus)