BoilerFaultCodesIdeal Fan Fault Code
Also written as FAN — same fault.
The Ideal Fan fault code means: your boiler has stopped working because the internal fan that safely removes exhaust gases is not running correctly.. It appears on 2 Ideal models in our database.
Technical description: Fan fault detected by diagnostic feature.
What causes the Ideal Fan fault?
This fault occurs when the boiler's safety system detects that the fan isn't spinning fast enough to clear waste gases from the flue. The most common reasons are mechanical wear in the fan motor bearings or a build-up of debris that prevents the blades from turning freely. Occasionally, the sensor that monitors the fan’s performance may be faulty, causing the boiler to shut down as a precaution.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ideal models that show the Fan fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Fan 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