BoilerFaultCodes NO OR LOW WATER FLOW RATE High
Boiler Fault Code NO OR LOW WATER FLOW RATE
Also written as NOORLOWWATERFLOWRATE — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code NO OR LOW WATER FLOW RATE 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 struggling to detect enough water flowing through it, which is preventing your hot water from working correctly. (As reported on Potterton Main Mersey Super)
Pick your boiler brand for the NO OR LOW WATER FLOW RATE fix
Source
Information for the NO OR LOW WATER FLOW RATE 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