Ideal showing F3 in Darlaston? The boiler could not confirm the fan speed, so it will not light. What to check outside, and why the rest is an engineer job.
Listen as the boiler tries to start. A rattle, whine or no fan sound at all tells the engineer a lot.
Check the flue outlet on the wall or roof for anything blocking it: nests, plants or rubbish. Look only, do not reach in.
One reset rules out a glitch. If F3 comes back, leave it and book a visit.
The fan or its wiring, followed by a combustion check to make sure the boiler is burning cleanly.
No, the boiler has refused to light without a working fan, which is safe. If you smell gas, get outside and call 0800 111 999.
It drives the fumes out through the sealed flue. No confirmed fan, no flame.
A fan is a single part on most models. The engineer can advise once they have seen the rest of the boiler.
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