How much does it cost to fix boiler error code Faulty primary circuit?

Typical repair cost for the boiler Faulty primary circuit fault is £100-£250 including labour.

Faulty primary circuit High

Boiler Fault Code Faulty primary circuit

Also written as FAULTYPRIMARYCIRCUIT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Faulty primary circuit appears across 2 boiler brands and 7 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 water pressure or the water isn't moving through the system properly, which has triggered a safety shutdown to prevent overheating. (As reported on Biasi Riva Compact 24S)

Pick your boiler brand for the Faulty primary circuit fix

Biasi Faulty primary circuit 1 model Ideal Faulty primary circuit 6 models

Source

Information for the Faulty primary circuit 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