Fan (If fitted) High

Ideal Fan (If fitted) Fault Code

Also written as FANIFFITTED — same fault.

The Ideal Fan (If fitted) fault code means: your boiler's internal air system is failing to move waste gases out of the flue, which is preventing the unit from firing up safely.. It appears on 1 Ideal model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: The diagnostics will indicate the nature of the fault to assist a speedy and effective repair

What causes the Ideal Fan (If fitted) fault?

This fault occurs when the boiler's internal computer detects that the fan is not spinning at the correct speed or has failed to start entirely. The most common reasons are a build-up of debris within the fan motor or a failure in the electrical signals sent between the control board and the air pressure sensor.

High winds during winter storms can occasionally cause back-pressure in the flue, which creates extra resistance for the fan and triggers this safety shutdown.

Typical repair cost £250-£450 (including labour)

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 Fan (If fitted) fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ideal Fan (If fitted) 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