BoilerFaultCodesIdeal F 1 Fault Code
Also written as F1 — same fault.
The Ideal F 1 fault code means: your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.. It appears on 1 Ideal model in our database.
Technical description: Low Water Pressure. Check system water pressure is between 1 & 1.5bar on the system pressure gauge.
DIY fix possible
Locate the filling loop (usually a silver flexible hose with small taps) underneath the boiler.Slowly open both taps one at a time until you hear water entering the system.Watch the pressure gauge and close both taps tightly once the needle reaches 1.5 bar.Press the 'Restart' button on the boiler control panel to clear the fault code.
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Ideal models that show the F 1 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal F 1 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