Boiler Fault Code F.075

Also written as F075 — same fault.

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

Fault code F.075 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 is struggling to detect the movement of water when it tries to start the heating, which usually means the internal pump is failing to spin or there is a blockage preventing flow. (As reported on Vaillant ecoTEC plus)