Thanks for the reply, but as I said in my post, he has no idea.
He checked all around the fan and found nothing amiss, and doesn't know how the water is getting in there.
Just had a new APS fitted and unfortunately there was another fault, which needed a new PCB.
However on checking the boiler for the new fault the plumber found water in the pipe going to the APS, he doesn't know why water is in there.
It might be condensation but in the 15 plus years of the...
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