BoilerFaultCodesWhat the manual says
Manufacturer manualFan fault
From this model's manual
Verified against the Ideal I Combi 2 installation & service manual, page 58.
What causes this fault?
This fault occurs when the boiler's control board sends a signal to the fan to start, but either the fan fails to spin or the board doesn't receive confirmation that it is moving. The most common reason is a mechanical failure of the fan motor, though it can also be caused by loose electrical connections or a fault within the main circuit board itself.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register →
Boiler cover options
Avoid the next call-out bill
A cover plan would handle faults like F3: no call-out fees, no surprise bills.
Approved partner
Get a quote →
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Affiliate links. We may earn a commission at no extra cost to you.