Question about Bosch HMV9305 Microwave Oven

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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


2 Answers


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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Apr 08, 2011 | Bosch HMV9305 Microwave Oven

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Hmv9305/01 microwave @ 13months old the magnetron blew, authorized bosch repairman, replaced using bosch magnetron. warranty for 90 days jan of 2011 same problem, why does this happen? should i ditch...

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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.
Very unusual and Bosch is a well respected name.
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....

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The HMV9305 has an automatic vent turn-on feature. It senses heat, possibly from the oven or range beneath, and turns on the exhaust fan until temps return to normal. Sometimes this may take 4-5 minutes, which can seem like an eternity of listening to the blower run, but it is a safety feature designed to prevent damage to the microwave from excessive heat generated by the cooktop or oven beneath it.

Jan 24, 2010 | Bosch HMV9305 Microwave Oven

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If the unit is brand new as you say then it is covered under the warranty and the 800# for Bosch is in your paperwork that came with it.

It sounds like the glass platen (turntable) hub is either binding or else the drive mechanism itself either has a bad tooth on the main gear or tooth wheel. Some may still use a chain type drive mechanism as well.

If you call that 800 number - the customer service dept there will advise you as to what needs to happen next. It's possible they will either replace or repair at their expense.

Who installed the unit?

Let me know?

Best regards,


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