How much does it cost to fix boiler error code Low water pressure light ON?

Typical repair cost for the boiler Low water pressure light ON fault is £80-150 including labour.

Low water pressure light ON High

Boiler Fault Code Low water pressure light ON

Also written as LOWWATERPRESSURELIGHTON — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Low water pressure light ON appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped working because the water pressure inside the system has dropped too low, which is causing it to lock itself to prevent damage. (As reported on Ferroli Falcon)

Pick your boiler brand for the Low water pressure light ON fix

Ferroli Low water pressure light ON 4 models

Source

Information for the Low water pressure light ON 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