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Old 11-30-2021, 05:39 PM   #1
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Replacing microwave/convection oven

On a recent trip my microwave/convection oven went kaput.

I have a replacement just like the old one but when I started to reinstall I noticed that the vent thru the wall was two inches off center which means two inches of the fan is blowing against the wall.

The fans are 10 inches wide with 1300cfm. My question is does anyone feel this is a serious problem? I can see why they did it because there is an aluminum stud to the right of the vent hole. There was no damge
where the air was hitting the wall on the previous unit.

If you can see the center line on the first picture you can see what I mean.

I can shift the oven two inches to the left but it will require some cabinet work and cutting the small ear off of the corian back splash.

I would like to leave it where it is but I am a little bit afraid to, that may be what burned the circuit board out the first time as well as heating up the plug.
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Old 11-30-2021, 07:17 PM   #2
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It would help to know what make and model of coach and microwave you have. It’s hard to generalize without.

My previous coach had the Sharp Carousel which is the most common Rv microwave for many years. When the old one went, I searched by make and model and found the direct replacement. That one was not vented to the outside but vented out the top grill. It bolted right in in exact location.
My current coach has the “same” but current model which was replace by the PO just before I got it so I don’t know what the vent looks like but if the non vented model worked I can’t see why the vent being off a little would hurt.

As for burning up your control board, the outlet or the plug, the Sharp Convection Microwave draws a lot of power. A high or low voltage will cause heat buildup. Also, we rarely plug and unplug the microwave so any minor dirt or arcing in the plug or outlet can cause extra resistance causing heat buildup. I really doubt it had anything to do with the vent.

The last thing that destroys microwaves is a MSW inverter. Microwaves really need a PSW inverter if your going to run on inverter power.
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Old 11-30-2021, 07:40 PM   #3
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My coach is in my signature (2015 DRV Tradition) The microwave/convection oven is the above the range GE PVM9179SK6SS. It also serves as the range vent-a-hood. This is basically the same unit I took out.

Your post got me to thinking that this unit can be vented up or back or not at all with charcoal filter so maybe a little restriction on the blowers would not be a big problem.
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Old 11-30-2021, 10:38 PM   #4
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Quote:
Originally Posted by 00 Buckshot View Post
My coach is in my signature (2015 DRV Tradition) The microwave/convection oven is the above the range GE PVM9179SK6SS. It also serves as the range vent-a-hood. This is basically the same unit I took out.

Your post got me to thinking that this unit can be vented up or back or not at all with charcoal filter so maybe a little restriction on the blowers would not be a big problem.
I thought the mounting look different than the Sharp. I guess I would question why the original had 2” covered but the manufacturer did that so the only other thought I had would be to call and ask them.
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Old 12-01-2021, 06:57 AM   #5
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Strange, I edited this post and now the pictures are upside down. They were right side up before the edit.
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Old 12-01-2021, 11:07 AM   #6
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My thoughts.


Like the others, I don't think the venting is an issue and it did not cause the failure of the circuit board. Likely, that rear vent, even with the partial blockage, vents freer than through the front.


Second, looking at the picture of the full cabinet space, the blockage appears to be the result of an assembly issue, possibly an error, but it would take another coach of the same make/model/year to know. Simply removing the wood spacer from the left side of the opening and shifting the oven over would line up the vent hole. However, as you noted, the Corian backsplash has already been cut to fit the current arrangement. Logic indicates that the Corian and cabinet opening should have been aligned further to the left. If an error was made during installation, then you have the results found in your coach.
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