BoilerFaultCodesIdeal FD Fault Code
The Ideal FD fault code means: your boiler has stopped heating because water is not moving through the system properly.. It appears on 4 Ideal models in our database.
Technical description: No water flow
What causes the Ideal FD fault?
This fault occurs when the boiler's internal sensors detect that water isn't moving through the unit quickly enough to safely carry heat away. The most common reason is a failed circulation pump or a blockage in the central heating pipes, such as built-up sludge or a closed valve. Because the water stays still, it would overheat the heat exchanger, so the boiler shuts down as a safety precaution.
This issue is more frequent in autumn when the heating is turned back on after a long summer break, as internal pump parts can seize up from lack of use.
DIY fix possible
Check that your home's water pressure gauge is between 1 and 1.5 barOpen all radiator valves and ensure no radiators are blocked by airRestart the boiler by pressing the 'Reset' button
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Ideal models that show the FD fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal FD 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 31 August 2026