Very easy job to both replace and test these just a screwdriver to undo the back panel to gain access to the terminations and a basic multimeter. You should get very low ohms reading as it is just a thermostatically controlled switch basically and should be on all the time it will only open the circuit if the temperature goes about a set perimeter which is usually stamped on the device itself.
Symptoms would be no power to oven at all or just will not get hot , but test first and test elements as well to ensure you replace correct part.
Buy cooker and oven spares from Ebay UK here
Buy a good Multimeter here on Ebay UK
With back access panels removed you can see the 2 over limit thermostats
they have blue wires going to them ill show close ups below
close ups of both upper oven and main oven thermal
over limit cut out thermostats
Pull of both cables and you can test it for continuity
it should be very low ohms resistance reading as this is
just a safety switch and should be on at all times.
testing with a multimeter 0.0 ohms so excellent
and continuity buzzer is buzzing see video for this
this one is held in by one screw and the other side fits into a bracket made for it
this is the unit free from oven and easy to replace
testing new thermal cut out over limit thermostat prior to fitting
just one screw so easy to do
see a video of this process below
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