How much does it cost to fix boiler error code FLOW panel LED not lit with hot tap open?

Typical repair cost for the boiler FLOW panel LED not lit with hot tap open fault is £120-220 including labour.

FLOW panel LED not lit with hot tap open High

Boiler Fault Code FLOW panel LED not lit with hot tap open

Also written as FLOWPANELLEDNOTLITWITHHOTTAPOPEN — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code FLOW panel LED not lit with hot tap open 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 not detecting when you turn on a hot tap, so it isn't starting the process to heat your water. (As reported on Grant Vortex Blue)

Pick your boiler brand for the FLOW panel LED not lit with hot tap open fix

Grant FLOW panel LED not lit with hot tap open 1 model

Source

Information for the FLOW panel LED not lit with hot tap open 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 7 July 2026