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Cold air is leaking into the house

Is there a way to check the damper in the microwave to see if it is open?

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  • Microwave Ovens Master
  • 2,113 Answers

Sometimes the damper is not installed by some amateur installers

Posted on Nov 30, 2013

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Posted on Jan 02, 2017

tiway1
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SOURCE: fan just circulates air instead of exhausting the air outside

The exhaust motor was not installed properly - it has to be turned 90 degrees so that the blower openings face up instead of the front. Whoever installed it didn't read the directions:)
Unfortunately, the unit will have to be taken down from the wall to correct the motor.

Posted on Dec 23, 2008

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We've replaced a GE JVM2070 with an LG LMV1813 microwave. The unit is vented out the back, but when new unit installed with the microwave damper attached it makes a horrific noise. Wen damper is removed...


I would suggest that you carefully review the installation instructions step by step and be sure your filters are installed properly.

You should also inspect your outside vent cover and do an air flow test or visual inspection of the entire length of the ductwork.

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If your microwave is ducted to the exterior the cold air could be from the outside if the backdaft damper is not functioning properly. If you have a HVAC system, the return air process can be pulling outside air through the hood making the condition worse. The microwave damper is usually on top of the microwave unit at the exhuast opening. Maybe some greasy dust is preventing the damper from closing all the way.

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There should have been a gravity operated damper installed when the microwave/hood vent was installed. Some installers are lazy and leave it off. Try to but a wind flap or whatever they call it from a building supply. You could also try a used place like Habitat for Humanities (Re Store). Unfortuneatly you'll have to drop the microwave to put it in

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It sounds like insufficient air flow. The damper must be one that doesn't require too much air flow to open it.

Was the damper he used to replace it the same as supplied by GE in the install kit? Otherwise, if the new damper has too strong a spring in the door, it will restrict air flow.

For more free DIY and other help & advice, feel free to contact me.

William E. Miller, AS-EET
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http://www.microwavecontrol.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"

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I had the exhaust switched from inside to outside venting, but there is no air intake. What do I need to check?


Check to see if the damper is stuck, either on the exterior vent outside the house or at the microwave. Also, did the blower get turned to point at the desired exaust direction. Unfortunately, both interior possibilities will require removing the microwave.

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The damper should closed when in convection mode and open when in the microwave mode, to keep the heated air inside the cavity.

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Cold air inside microwave


You are probably missing the outside steel damper,you might have it laying on top of unit.or if you had it service by the same guy that did mine .He was going to leave it of,he told me there was no need for it.Well i do H.V.A.C.and when ever you are piping to the outside you need a damper,not just the one on your siding,but one further in.

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Fan just circulates air instead of exhausting the air outside


The exhaust motor was not installed properly - it has to be turned 90 degrees so that the blower openings face up instead of the front. Whoever installed it didn't read the directions:)
Unfortunately, the unit will have to be taken down from the wall to correct the motor.

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Cold air from outside coming in house through vent


Sounds like your damper (flap) outside is working, and that's probably the first thing to check. Wind may be also pulling the damper open from time to time. Hopefully the pipe fitting is sealed, and the pipe is insulated anywhere it runs through any unheated portion of the house. Some amount of cold air getting in will be unavoidable. The best bet next might be to look over the two pages in the installation instructions that deal with outside venting. If you don't have the installation instructions, you can get a copy here: http://www.geappliances.com/service_and_support/literature/ Then if you don't notice any obvious problems with the installation, it may be time to contact the installer for their two cents.

Feb 05, 2007 | GE Spacemaker JVM1640SJ Microwave Oven

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