BoilerFaultCodes 430 High
Boiler Fault Code 430
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 430 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 has detected that water is moving too slowly or not at all through the system, causing a heat imbalance that has triggered a safety shutdown. (As reported on Ideal Ideal Classic SE15P FF)
Pick your boiler brand for the 430 fix
Source
Information for the 430 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