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Vent fan runs intermittently, starts on and off regularily

I have a brand new Bosch HMV9305 Over-The-Range Microwave and Ventilator. I haven't started using it yet. But for some reason the fan/blower will run (at somewhat slow speed) automatically for maybe 5-10 minutes then stop for a few minutes, and start again. It was supposed to be installed for interior room circulation. I read on the manual that the fan will start will the temperature around the microwave is high, but the temperature is not high. The room is kept at 75 degree.

Posted by John Peng on

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Anonymous

I read in a different online review that whenever a room is above 70 the vent fan will start automatically for this microwave to cool it down. It is a built in feature and there is no way to turn it off.

Posted on Dec 10, 2007

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I don't have the manual but there should be a temperature setting for the fan to come on.

Posted on Jun 23, 2007

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How does this microwave exhaust system work. The installer did not use any duct work, so is the exhaust internal somehow? There is no grill on the exterior for exhaust
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If you use it with nothing in the cavity, that will kill the magnetron otherwise it will last for years and years.
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If there is a probem with the oven, Bosch will replace it so take it up with Bosch.
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Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips

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