How much does it cost to fix boiler error code HIGH WATER FLOW?

Typical repair cost for the boiler HIGH WATER FLOW fault is £120-220 including labour.

HIGH WATER FLOW Medium

Boiler Fault Code HIGH WATER FLOW

Also written as HIGHWATERFLOW — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code HIGH WATER FLOW 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 correctly regulate the flow of water, which is causing it to stop operating properly. (As reported on Chaffoteaux Corvec 28 OF BF)

Pick your boiler brand for the HIGH WATER FLOW fix

Chaffoteaux HIGH WATER FLOW 1 model

Source

Information for the HIGH WATER FLOW 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