Question about Whirlpool MH1140XM Microwave Oven

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Complete functioning control panel but nothing works.

Manufacturer: Whirlpool Model no: MH1140XMB-1 The other day, I went to replace the range light and ended up breaking the screw connector from the bulb (the installer glued the bulb in place.) so I flipped the relay for the microwave, used my pliers to remove the rest of the bulb, (didn't have a replacement bulb so I just screwed the cover back on.) and then flipped the relay back on. The control panel came up like it had lost power, so I pressed the clock button and re-entered the time. My wife then tried using the oven, and it let her enter the cooktime, and even hit start. At which point the oven should come on, nothing happens, but the timer starts counting down like it's cooking. Upon investigating other functions, it also appears that the vent fan isn't working, and upon checking the voltage to the empty bulb with my multimeter, it was 4VAC, no matter how the switch was set on the control panel. Any tips would be much appreciated.

Posted by Morris Buel on


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William Miller

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This is a problem with the control panel assembly, which we repair nationwide for $32.50 postpaid. Sometimes the bulbs short when they fail, and that damages the control board. This also can happen when bulbs are removed or installed without first unlugging the oven or turning off the breaker. For critical safety & disassembly info and other details of our service, see

Posted on Jan 16, 2007

  • DG Shamburger
    DG Shamburger May 04, 2014

    You said it just like it happened to me; the bulb broke loose and their was a wad of hot glue there. You in the world turns off the juice to change a light bulb, not me. I guess I will replace the circuit board.

  • DG Shamburger
    DG Shamburger May 04, 2014

    Who in the world. Sorry




This solution does not indicate how to get a control panel repaired nationwide etc.??

Posted on Jan 17, 2008


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The Magnetron is out on our over the range Whirlpool microwave. I can get the part locally. Is this something I can replace myself?

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4. Once the case has been removed locate the High Voltage Circuit. You can't miss it. There should be warning labels. Remove the protective guard the covers the circuit and remove.

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CAUTION: DO NOT operate the oven with the case removed, or try servicing anything with the unit plugged in.

There are several good websites that you can use as a reference that have exploded view parts illustrations:

Use these sites to locate and identify any parts to avoid confusion.

Removing and reinstalling the magentron at this point should be fairly simple. There is one (sometimes two) plug to remove from the filament and several screws holding it in place. Make sure you have the safety shield and exterior case reinstalled prior to testing the oven. Place a glass of water in the oven before test operating. The water acts as a load for the RF and will also indicate whether or not the magentron is working properly. The water should be near boiling within 2 minutes on most ovens. DO NOT operate an oven when it is empty. This can damage the magentron.

If you have any questions, please let me know. I hope this helps you.

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I can't find if there's a difference between model PLMV178HC and PLMV178HCA. Every search for PLMV178HC redirects me to PLMV178HCA.
So I'm giving you information based on model PLMV178HCA. If you end up with a wrong part, the supplier has a very liberal simple return policy.

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For model PLMV178HCA, that is part number 5304470533 and you can get it from Sears online for $89.95 (subject to change).

At my Web site, I have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes. (Also, the service manual is here.)

If you have any trouble getting the grille off once the screws are removed, slide the hood vent grille to the left about 1/4", then then pull it forward. On some models there are L-shaped clips that fit into a slot to hold bottom of the vent.

Be very careful when disconnecting the cables & wires. Some connectors have a locking tab (see photo) Next remove the keypad strip (see photo) Then simply move your circuit board into the new frame.

Be careful, because your display tube is made of glass, and if it breaks, the board must be replaced as well.

Let me know by e-mail if I can help further.

William E. Miller, AS-EET
Microwave Oven Control Panel Repair Nationwide "Recycling by repairing since 1982"

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You can download owner's manuals and installation instructions for several brands (including Amana, Frigidaire, Jenn-Air, Kitchenaid, Litton, Maytag, Roper, Tappan, Thermador and Whirlpool) here.

Enter it as MMV1153WB0 (no dash, zero on the end, not "oh")

Or just get it here, to be more exact.
On page 4, it says:

"Installing/Replacing Filters and Light Bulbs
■ Grease filter: Grease filter is on the underside of microwave
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Remove 2 screws on the vent grille, tilt the grille forward, lift it
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■ Cooktop light(s): The cooktop light bulb(s) is(are) located on
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Remove bulb cover screw, and open the bulb cover. Replace
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■ Cavity light: The cavity light bulb is located behind the vent
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cover, and is replaceable. Remove 2 screws on the vent grille,
tilt the grille forward, and lift it out. Open bulb cover and
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with screws."

HINT: Unplug the oven before removing or installing the bulbs, or you may need this service.

You can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites. Hope this covers it.

William E. Miller
[email protected]

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

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Whirlpool MH1140XMB-2 mic won't start

This is usually caused by either a bad door switch or a loose door switch mount, which are pretty simple problems to fix.

Even though a door switch clicks, it may still be bad inside.

Door switch or mount trouble is usually caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

If the switch mount is broken, it's usually more economical and safer to add a dab or two of hot glue to the mount to secure the switch. Let it cool for about 30 minutes before using.

One test that sometimes helps is to gently lift up (and/or push down) on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.

You can find helpful exploded view diagrams and order parts by entering your full model number here.

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, & testing.


Or you can view and download it here.

our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

If you only need a switch, you can order a universal type here for $5 postpaid.

If you've recently had trouble with your cooktop lights, one may have shorted, causing a problem on your control circuit board, which we regularly repair for $39.95 in about a week or so with a one-year guarantee.

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

William E. Miller
[email protected]

Oct 09, 2009 | Whirlpool MH1140XM Microwave Oven

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