My AEG cooker switches itself off after about 15 minutes, the light in the oven goes off and even if you increase the set temperature on the thermostat the"heating" light does not come on. After about another 10 minutes it seems to reset itself and functions again but then the cycle repeats. The oven is fitted with a cooling fan that keeps the controls at a reasonable temperature. If this is not functioning a thermal cut out operates and closes everything down, which is what is happening. I took the top of the oven and confirmed that the cooling fan was not being powered up because the inline thermal cut out had failed. Looking at other blogs it appears that the purpose of the cutout is simply, to provide an overrun so as to carry on cooling the oven when it is turned off , it is not to protect the fan! Is this correct?