BoilerFaultCodes Flashing 70 Medium
Boiler Fault Code Flashing 70
Also written as FLASHING70 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Flashing 70 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 your hot water, which may cause your taps to run cold or prevent the hot water from switching on reliably. (As reported on Heatline Capriz 28)
Pick your boiler brand for the Flashing 70 fix
Source
Information for the Flashing 70 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