BoilerFaultCodes 0A30 High
Boiler Fault Code 0A30
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 0A30 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling to detect the flow of water because of a faulty electrical connection inside the unit, meaning it will likely refuse to heat your water. (As reported on Alpha Pro Tec Plus)
Pick your boiler brand for the 0A30 fix
Source
Information for the 0A30 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