In message .uk, Ed
Sirett writes
On Fri, 11 Feb 2005 17:35:45 +0000, Mike Dodd wrote:
?

As always, any help appreciated.

Sounds very much as you would expect if the PCB (probably but not always a
relay on it) has a fault. The power is applied to the fan which starts
when the APS switches over the relay is meant to do so as well and keep
the power to the fan going. If the relay is stuck the power gets cut and
the fan slows down until the APS switches back.

Ed - relays very seldom stick (only when a short causes the contacts to
weld together. It's usually whats driving it not getting up to a
sufficient voltage to energise it sufficiently.
--
geoff