No Water Flow Fault High

Ideal No Water Flow Fault Fault Code

Also written as NOWATERFLOWFAULT — same fault.

The Ideal No Water Flow Fault fault code means: your boiler has detected that water is not circulating properly through the system, which means it will stop providing heating or hot water until the flow is restored.. It appears on 3 Ideal models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Insufficient water flow detected.
Typical repair cost £150-300 (including labour)

Engineer required

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

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Ideal models that show the No Water Flow Fault fault code

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

Source

Ideal No Water Flow Fault fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

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