BoilerFaultCodesWhat the manual says
Manufacturer manualFan Fault
From this model's manual
Verified against the Ideal Logic Max Combi installation & service manual.
What causes this fault?
This fault occurs when the boiler's control board sends a signal to the fan but does not receive the correct speed feedback in return. The most common cause is a mechanical failure within the fan motor or a buildup of dust and debris that prevents the blades from spinning at the required safety speed.
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 4.7: 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.