How much does it cost to fix boiler error code G30?

Typical repair cost for the boiler G30 fault is £100-200 including labour.

G30 Emergency

Boiler Fault Code G30

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code G30 appears across 2 boiler brands 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 currently configured for a specific type of bottled gas (Butane) rather than the standard mains gas supply, and it cannot safely operate in its current mode. (As reported on Biasi Parva 28S)

Pick your boiler brand for the G30 fix

Biasi G30 1 model Sime G30 1 model

Source

Information for the G30 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 7 July 2026