On 20/12/2018 12:57, newshound wrote:
My Kenwood oven has two "thermostats" on the main frame, not the
standard temperature controlling ones, but apparently for
overtemperature protection.

https://www.espares.co.uk/product/es...ctur erId=435


and

https://www.espares.co.uk/product/es...cturerId= 435


The first is open circuit, the second closed circuit.

I think I would have *expected* them to be closed circuit, and to open
on overtemperature (like the safety protection on tumble dryer heaters)
but does anyone know for sure? I'll go and test them anyway.

I have it sussed, the open circuit one closes when it is warmed, the
closed circuit one opens. The first one must turn on the fan, the second
one is the "fire" protection. I think I will wire a neon to the second
to see if that is why I am having problems. I wonder if I have an
insulation problem and that this trip is getting too hot, too soon.