Boiler Fault Code No code displayed

Also written as NOCODEDISPLAYED — same fault.

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

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

Most common meaning Your boiler has likely overheated because the gases exiting the system are too hot, causing a safety sensor to automatically shut it down. (As reported on Worcester Bosch Greenstar i)