BoilerFaultCodesIdeal F17 Fault Code
The Ideal F17 fault code means: your boiler has detected that the internal pump, which moves water around your pipes and radiators, is not working correctly.. It appears on 3 Ideal models in our database.
Technical description: Pump Fault: Check pump wiring, if OK replace pump
What causes the Ideal F17 fault?
This fault occurs when the boiler's control board detects that the internal pump is not spinning or drawing the correct amount of electricity. The most common reason is that the pump has seized due to a buildup of debris or sludge in the system water, or the motor has simply failed after years of heavy use.
This fault is more common in autumn when the heating is turned on for the first time after summer, as the pump can seize if it has been sitting idle for several months.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Search the official register for a qualified engineer in your area.
Gas Safe Register →Ideal models that show the F17 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal F17 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 27 April 2026