Yep mine is doing this too it runs for a short while only some times and the switch does nothing. There is power to the device and this has been tested with a multi meter. The door close mechanism is also activating ok under a meter test. The heating coils read resistance and not open circuit.
Is there any othe tests i can do that will inform me the of the problem. There are some little thermisters above the heating elements can these be tested for working state by puting a meter across them. I have noticed a relay and the mechanical rotary switch are these also troublesome parts?
Martin Newbold, November 2006