How much does it cost to fix boiler error code 70 Flashing?

Typical repair cost for the boiler 70 Flashing fault is £120-200 including labour.

70 Flashing High

Boiler Fault Code 70 Flashing

Also written as 70FLASHING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 70 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 is struggling to detect the temperature of the water coming out of your taps, which means it will likely stop providing hot water until this is resolved. (As reported on Heatline Capriz 24)

Pick your boiler brand for the 70 Flashing fix

Heatline 70 Flashing 2 models

Source

Information for the 70 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