Boiler Fault Code 2/3/7

Also written as 237 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026

Fault code 2/3/7 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 The internal computer board of your boiler has developed a serious fault and can no longer control the heating process. (As reported on Worcester Bosch GB162)