How much does it cost to fix boiler error code Flashing dot D2?

Typical repair cost for the boiler Flashing dot D2 fault is £100-280 including labour.

Flashing dot D2 High

Boiler Fault Code Flashing dot D2

Also written as FLASHINGDOTD2 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code Flashing dot D2 appears across 1 boiler brand and 1 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 a general ignition or operational failure and has locked itself out for safety. (As reported on Gledhill GB35C)

Pick your boiler brand for the Flashing dot D2 fix

Gledhill Flashing dot D2 1 model

Source

Information for the Flashing dot D2 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