Our oven has a thermstat that constantly toggles the oven motor on and off based on whether the oven has reached the set heat. When the motor is off, opening the oven causes the temperature to drop, which itself causes the motor to start up sooner. Therefore this is Ossur on Shabbos and must be opened only when the light is on.
My question is nobody ever heard of an Issur to close it when the light is on, and why not? Surely by closing the oven you increase the temperature and the motor will switch off sooner?
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