How much does it cost to fix boiler error code Flow temperature low?

Typical repair cost for the boiler Flow temperature low fault is £90-250 including labour.

Flow temperature low High

Boiler Fault Code Flow temperature low

Also written as FLOWTEMPERATURELOW — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Flow temperature low 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 is failing to reach the required temperature for heating your home, likely because of a setting issue or a buildup of soot inside the unit. (As reported on Grant Vortex Blue)

Pick your boiler brand for the Flow temperature low fix

Grant Flow temperature low 1 model

Source

Information for the Flow temperature low 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