BoilerFaultCodesYour boiler has stopped working because it cannot properly control the fan that removes waste gases from the system.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fan problem – tachometer signal interrupted fan connection or damaged debris in fan. You need to check and clean fan debris
What causes this fault?
This fault occurs when the boiler's computer cannot detect the speed of the fan, often due to a build-up of dirt or debris inside the fan's blades. If the fan cannot spin effectively or communicate its speed back to the system, the boiler will shut down as a safety precaution to prevent dangerous fumes from staying inside the unit.
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 →Protect yourself from future repair bills
A boiler cover plan would cover faults like F15 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Ferroli Modena HE is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.