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I have a whirlpool MH3184XPB undercounter microwave. It has started to hum and the vent fan motor is rotating very slowly like a relay is stuck even when the fan is turned off. Do you know what the problem is?

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It's probably a shorted relay or triac on the control panel.

We repair these on a regular basis for customers nationwide with our guaranteed $39.95 service with a full one year warranty.

We have full details, plus critical safety, disassembly, and troubleshooting info at our site. You'll find a link to our site in our listing here on FixYa: http://tinyurl.com/yzjozk

NOTE: There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting.

Please feel free to contact me directly if you need more help.

We're happy to help and we appreciate your thoughtful rating of our answer.

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

Posted on Jun 23, 2008

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1 Answer

Tappan microwave vent motor and cooktop lights not working


see this test . God bless youThis microwave oven repair is only for over the range(OTR) models. First, with microwave still installed, gain access to the control board and check for voltage from the fan relay. If you are not getting voltage from the fan relay on the control board, and your display says fan is on, then you need a new control board.
Again, this microwave oven repair is for OTR models. If you know your light bulbs are good and your display is telling you that they should be on, check the light relay on your control board. If no voltage is found at that relay, then replace the control board. Otherwise your problem is in the light socket, wiring, or wire connectors. You can get to all of that by unscrewing 6-8 screws under the unit and taking the bottom panel off.If voltage is present and the wiring that you can see looks good, then you will have to take the unit down and test for voltage at the fan itself. If the voltage is present there, then test the motor itself and/or start capacitor for the motor. The fan motor assembly will slide out of the top of the unit after you take it down and unscrew 2 screws. Below, in the list of component testing, you will see how to test the motor and start capacitor. get the part from
www.repairclinic.com
5f18838a-a52c-4961-b49c-e82cdadd074f.gif

Apr 04, 2013 | Tappan Microwave Ovens

1 Answer

After the GE JVM1190BY002 Microwave stops its microwave sequence the fan motor above the touchpad just sits and hums but doesn't shut off.It still heats food corectely and it stops humming when I open...


You should first be sure your filters are clean and that your ductwork is clear.

See this link for a bulletin that may address your problem.

Otherwise, see this link in case you have a sticky door switch or relay.

You can find helpful GE exploded views and order GE parts here, and download GE owner's manuals and installation instructions here.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Oct 20, 2011 | Microwave Ovens

1 Answer

Model mh3184xpso whirlpool microwave the vent fan for steam from the stove is humming in the off position. it works on all speeds but it runs real slow on the off position and hums.


Have you recently had a failure with the cooktop lights?

If so, we see (and repair) this a lot. The problem is on the control circuit board, which we regularly repair nationwide by mail for $39.95.

At our Web site, you can get details of our service, plus we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

The lights can can be inoperable or stuck on or stuck in "night light" mode. Sometimes this will similarly affect the fan operation or inside light, too.

Even if you've not had a recent failure with the lights, i would bet it's a leaky hood fan triac on the control circuit board.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Mar 13, 2011 | Whirlpool MH3184XP Microwave Oven

1 Answer

No power on unit. power ok at outlet. it's a 2005 whirlpool mh3184xpb-1


Hi,


Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Basic
Microwave Oven Troubleshooting Tips

heatman101

Feb 15, 2011 | Whirlpool Microwave Ovens

1 Answer

My microwave is making a humming noise when plugged in and the fan continues to run when not in use what is wrong?


is the turntable rotating?

I suspect a jammed motor drive and a short circuit in this situation. I would be seeking a quote for repair and not trying to use it incase it over heats and catches fire. The continuos running of the fan is a definite worry Unplug it before touching it in case some parts of the case are live.
Please rate my help++++Thanks for using FIXYA

May 07, 2010 | Whirlpool MH7140XF Microwave Oven

1 Answer

My whirlpool microwave was hooked up but doesn't seem to be venting out the roof. It has a vent running from the top of it through a cabinet and out the roof. What might be blocking the venting process?


the fan motor needs tobe turned around take screws out of top front remove front fan grill pull out fan assibliy and turn around. this will pull air out of your house

Sep 21, 2009 | Whirlpool MH7140XF Microwave Oven

1 Answer

GE Microwave oven vent fan not working


You are correct the fan motor is either stuck or needs replaced.

There is no way to do this without removing the entire microwave. In case your not familiar with how microwaves work, there is a capacitor that is very large inside and can hold a charge even after it is unplugged for up to 24 hours, please take action to prevent getting shocked.

Sep 11, 2009 | GE JVM1750SMSS Microwave Oven

1 Answer

Frigidaire Microwave plmv169dcd Start Capacitor


The starting capacitor is used to start the hood vent fan motor. It's also called the hood capacitor.

On page 8 of the document you refer to above, on figure O-1, you will find the hood capacitor. It is shown on the control unit (circuit board). I've attached a snapshot of that area below.

Its leads connect to terminals A1 and A3. The hood fan red wire goes to A1, and the yellow wire goes to A3.

That part is not shown in this document as a separate part, so you will have to get it generically from an appliance parts store or electronics supplier, but you will have to order it by value.

You need to look on it and it will say something similar to this:
"7 uF 230V". In this example, that would be a 7 microfarad, 230 volt capacitor.

It's okay to get a capacitor with a little higher voltage rating, but not lower.

The capacitor, if truly bad, may not look bad. It can be quick-checked with an ohmmeter to see if it will charge and discharge (the meter will first indicate low resistance then go high to infinity). This is not a full-blown test, but for this kind of capacitor it may be enough.

You should check the solder connections, also. It's a large part, and sometimes they don't get enough solder on them. The connection may be cracked and just need to be resoldered.

Since a new thread was started, it makes it harder to follow along the saga...

But this problem could be a bad (or jammed or obstructed) hood fan motor, a flaky relay on the control board, a bad cap, or bad wiring.

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Microwave hood fan motor starting capacitors usually look something like this, and may be red, blue, green, orange, etc.

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Dec 04, 2007 | Whirlpool GH7145XF Microwave Oven

2 Answers

Frigidaire PLMV169CD Micowave Hood Vent fan Hums, but won't run


If you have an old analog multimeter, you can put it across the motor start capacitor and the needle should deflect to low ohms position then ramp up to the open or infinite ohms position. You can remove it and test it the same way. Also, doing this test should store a dc voltage on the leads which can then be read even with a digital multimeter. I have even used an audio output from a cheap amplifier to determine if audio is transmitted from one lead to another. The capacitor works by shifting the starting current by 90 degrees and the motor acts as you say it does if the cap is bad. Make sure you orient the cap properly with the positive and negative terminals in the proper holes

Nov 30, 2007 | Whirlpool MH1150XMQ Microwave Oven

1 Answer

Exhaust fan


It sounds like the bearings may be going bad on the fan motor. It's also possible that there may be sonething stuck in the the grlle or fan area, like a paper label, etc. You can find exploded views and order parts here: http://tinyurl.com/gv383 We have critical safety and disassembly help files at our site, which you can find via our listing here: http://tinyurl.com/yzjozk

Jan 23, 2007 | Whirlpool GH7145XF Microwave Oven

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