On 21/12/2018 06:54, alan_m wrote:
On 20/12/2018 13:19, newshound wrote:
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.

According to the links you posted the operating temperatures are 160 or
175C. That is too low for an oven unless both switch something on when
the operating temperature is reached.

I would have expected an over temperature protection cut-out to be
250C, or 500C for self cleaning ovens.

This is outside the oven insulation, on the back plate at about the
level of the gas pipes