BoilerFaultCodesIdeal No flow Fault Code
Also written as NOFLOW — same fault.
The Ideal No flow fault code means: your boiler has stopped working because it cannot detect that water is moving through the system as it should.. It appears on 1 Ideal model in our database.
Technical description: If a flow switch is not connected to the boiler a link should be fitted between the 2 terminals for the flow switch. If the terminals are left disconnected the display will indicate 'No flow' and the boiler will not operate.
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 flow fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal No flow 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