BoilerFaultCodesIdeal F[-] Fault Code
Also written as F — same fault.
The Ideal F[-] fault code means: your boiler has detected a generic internal system error that prevents it from operating normally, and it requires a professional to diagnose the specific underlying cause.. It appears on 7 Ideal models in our database.
Technical description: Boiler has a fault for a specific error
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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A cover plan would handle faults like F[-]: no call-out fees, no surprise bills.
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Ideal models that show the F[-] fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal F[-] 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