How much does it cost to fix boiler error code 90 Flashing?

Typical repair cost for the boiler 90 Flashing fault is £120-250 including labour.

90 Flashing High

Boiler Fault Code 90 Flashing

Also written as 90FLASHING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 90 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 has detected that it is getting too hot and has automatically switched itself off to prevent any damage or safety hazards. (As reported on Heatline Capriz 25 System)

Pick your boiler brand for the 90 Flashing fix

Heatline 90 Flashing 2 models

Source

Information for the 90 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