Microwave - Vent Getting Louder or Changing Speeds

On over-the-range microwave ovens, you may find the vent fan is changing speeds or getting louder while it is running. This can be normal. Please review the following information prior to scheduling repair service for your microwave.

 

Understanding Why the Vent Is Getting Louder or Changing Speeds on a Microwave

In both recirculating (with the charcoal filter in place) or in vented applications where the ductwork causes an excessive back pressure on the fan, the fan will automatically kick up to a higher speed when set on high. This is done to compensate for the added back pressure. It will stay on this higher speed at the medium and low settings as well.

 

Placing the Fan In Medium or Low Speed

Starting with the vent fan in the off position, press the vent fan pad twice to get to the medium speed or three times to get to the low speed.

 

Confirming That the Vent Is Changing Speeds

  • Push the VENT FAN pad followed quickly by the VENT FAN BOOST pad. That way the fan shifts from LOW to VERY HIGH as quickly as you can push the pads. You should be able to hear/feel this difference, even with a charcoal filter installed.

  • On models which only have the VENT FAN pad, press VENT FAN once for boost fan speed, twice for high fan speed, a third time for medium fan speed, a fourth time for low fan speed, and a fifth time to turn the fan off. Pressing through the settings will enable you to hear/feel the difference in the fan speeds.

View a Short Video about Microwave Vent Sound Levels

Video - Microwave Vent Fan Speed

 
 

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Additional Support

Should you determine that you need to have a service person to check out your appliance, it is our pleasure to help. From a repair to a replacement, we can help you make each decision with confidence. Please reach out to us for assistance with every appliance need.