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You’re correct - F.62 does indicate a gas valve problem. Either the valve isn’t closing when it should, or the PCB isn’t correctly detecting the operation of sensors in the boiler. Either way, the fault needs to be diagnosed and fixed by a Gas Safe registered engineer.
In the meantime, since the ability of the gas valve to close is in doubt, you shouldn’t use the boiler. It be wise to close the gas cock on the supply to the boiler, which is just underneath it.
This is a nuisance - sorry. So the sooner you can book a visit the better, of course. Do you know who to call?
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