How much does it cost to fix boiler error code B, C, D, E & F neons flashing?

Typical repair cost for the boiler B, C, D, E & F neons flashing fault is £120-£240 including labour.

B, C, D, E & F neons flashing High

Boiler Fault Code B, C, D, E & F neons flashing

Also written as BCDEFNEONSFLASHING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code B, C, D, E & F neons flashing 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 problem with how it moves air and exhaust gases through the system, causing it to shut down for safety. (As reported on Baxi Combi 130e)

Pick your boiler brand for the B, C, D, E & F neons flashing fix

Baxi B, C, D, E & F neons flashing 1 model

Source

Information for the B, C, D, E & F neons 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