Boiler Fault Code Spare PCB Not Set

Also written as SPAREPCBNOTSET — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code Spare PCB Not Set appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's computer brain has been replaced or reset and needs to be told which specific model it is controlling before it can start working. (As reported on Ideal Logic Max Heat 2)