Boiler Fault Code No code

Also written as NOCODE — same fault.

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

Fault code No code appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has shut down because it is overheating, likely because water is trapped inside it or the pressure is too low to circulate properly. (As reported on Worcester Bosch Greenstar Heatslave II)