BoilerFaultCodesYour boiler has stopped working because the internal fan, which safely clears exhaust gases, isn't spinning at the correct speed.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fan speed incorrect See chart
What causes this fault?
This fault occurs when the boiler's processor detects that the fan is not rotating fast enough to safely expel waste gases from the flue. The most common reasons are a build-up of dirt within the fan housing, worn-out bearings that cause the motor to seize, or a communication failure between the fan and the main control board.
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 Fan speed — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Potterton Envoy 30 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.