BoilerFaultCodes Fault 30 7 High
Boiler Fault Code Fault 30 7
Also written as FAULT307 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Fault 30 7 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is having trouble managing the temperature of its internal water circuits, which will likely stop your heating and hot water from working correctly. (As reported on Worcester Bosch Greenstar CDi Compact)
Pick your boiler brand for the Fault 30 7 fix
Source
Information for the Fault 30 7 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 27 April 2026