HIGH WATER FLOW Medium

Chaffoteaux HIGH WATER FLOW Fault Code

Also written as HIGHWATERFLOW — same fault.

The Chaffoteaux HIGH WATER FLOW fault code means: your boiler is struggling to correctly regulate the flow of water, which is causing it to stop operating properly.. It appears on 1 Chaffoteaux model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: i) Water governor sticking
Typical repair cost £120-220 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Chaffoteaux models that show the HIGH WATER FLOW fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Chaffoteaux HIGH WATER FLOW fault code information on this page is sourced and cross-checked against the official Chaffoteaux service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026