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

Typical repair cost for the boiler Faulty primary circuit fault is £120-250 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 31 August 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 detected that water is not circulating properly through your heating system, so it has safely shut down to prevent damage. (As reported on Ideal Mini HE)

Pick your boiler brand for the Faulty primary circuit fix

Biasi Faulty primary circuit 4 models Ideal Faulty primary circuit 3 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 31 August 2026