In message .uk, Ed
Sirett writes
On Tue, 28 Oct 2003 00:49:34 +0000, Sparks wrote:


If so, what is the likely problem?

This is almost certainly a fault in the control box.
The fan runs up, the air pressure switch changes over, but the box does not
change over in response, thus the fan is then unpowered and winds down,
the air pressure switch changes back, the fans starts...

IIRC this is a stuck relay in the control box.
A new box is available from. geoff i.e. www.cetltd.com
The control box is reasonably easy to fit if you are experienced with
electric applinace repairs involving about 20 connections.

5 flying leads, two molex connectors and the HT lead

it's retained by 4 nylon standoffs
--
geoff