You need to determine if the microwave has been modified to vent to the outside of your house. Most of them do not. They merely circulate air through a metal filter at the bottom of the microwave and back into the kitchen. The microwave will have a fan button on the front panel that will manually turn the fan on and off and usually will have two speeds. It sounds like someone may have modified your microwave fan to operate on a thermostat instead of the usual manual operation. If so, that would be highly unusual. I would try to locate the thermostat and disable it. I would start by removing the metal panel and filter at the bottom of the microwave and look for a thermostat attached to the fan motor. Good luck.
|