Excessive temperature on primary circuit Unknown

Boiler Fault Code Excessive temperature on primary circuit

Also written as EXCESSIVETEMPERATUREONPRIMARYCIRCUIT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code Excessive temperature on primary circuit appears across 2 boiler brands and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

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Biasi Excessive temperature on primary circuit 4 models Ideal Excessive temperature on primary circuit 1 model

Source

Information for the Excessive temperature on 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