raden explained :
I sold someone a fan for his CH boiler a couple of months ago and he swears
that it causes RF interference. I sent him another one which he says is OK.
We've also changed his pcb for him (to eliminate the possibility of it being
a relay problem

Now given the fact that it's a shaded pole motor and the connections to it
are sound (i.e. electrically, it's just a coil of wire) does anybody have an
explanation ?

None... Except the connections were not in fact tight, or a fault on
the PCB.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk