BoilerFaultCodesYour boiler has shut down because the internal fan is spinning faster than the system can safely control.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: The fan speed is too high
What causes this fault?
This fault occurs when the boiler's control system loses the ability to regulate the fan, causing it to spin at an unsafe speed. It is usually triggered by a communication failure between the electronic control board and the fan motor, or a physical defect within the fan's internal sensors. The boiler shuts down immediately as a safety precaution to ensure the gas and air mixture remains stable.
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 C6215 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Worcester Bosch GB162 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.