How much does it cost to fix boiler error code 30 Flashing?

Typical repair cost for the boiler 30 Flashing fault is £120-200 including labour.

30 Flashing High

Boiler Fault Code 30 Flashing

Also written as 30FLASHING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 30 Flashing 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's temperature gauge is having trouble reading the water heat levels, causing the system to stop heating your home as a safety precaution. (As reported on Heatline Capriz 24)

Pick your boiler brand for the 30 Flashing fix

Heatline 30 Flashing 2 models

Source

Information for the 30 Flashing 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