Quick Question!

Have you ever purchased from PartSelect.com before?

Models > MH7140XFB0 > Instructions

MH7140XFB0 Whirlpool Microwave - Instructions

All installation instructions for MH7140XFB0 parts

These instructions have been submitted by other PartSelect customers and can help guide you through the microwave repair with useful information like difficulty of repair, length of repair, tools needed, and more.

All Instructions for the MH7140XFB0
16-30 of 158
Search Instructions
Keep searches simple, eg. "belt" or "pump". Need help?

Door handle broken

  • Customer: RON from ANDERSON, SC
  • Difficulty: Very Difficult
  • Time to Complete: More than 2 hours
  • Tools Required:
  • 55 of 73 people found this instruction helpful
First I tried to remove the inside choke cover on the door. After breaking it in three pieces, I knew we were in trouble. Once that is removed, you have to remove the choke to get to the screws that hold the handle in place. Try to remove the choke without doing more damage appears to be impossible. A call to my local appliance repair center confirmed that replacing the handle is almost impossible to do without damaging the door. They do not even attempt to replace one. By the time you replace the handle, you will need a new door and then you realized you would had been better off the replace the oven. And that what we will do. A four year old over-the-range microwave and no door handle. It is a shame, but you hear the same stories from others. I am in the food business and my company uses commercial microwaves. We replace handles on these units with no problems, so I assumed I would do the same for my home unit.
As my local service center replied, "those doors were never intended to come apart." And I agree, and certainly not in one piece. Anyone need a handle for a Whirlpool m/w?

My microwave began suddenly making a loud humming noise while cooking food.

  • Customer: Lindsay from Nampa, ID
  • Difficulty: A Bit Difficult
  • Time to Complete: 1- 2 hours
  • Tools Required: Nutdriver, Screw drivers
  • 108 of 233 people found this instruction helpful
My microwave began suddenly making a loud harsh humming noise while cooking food. I did not let it go on long enough to know if it cooked the food or not. I did some Internet research and learned that it was likely the Magnetron. The test for this was to run the microwave for at least a minute on the lowest power setting and see if the noise cycled on and off. It did, so I (actually, my wife) ordered the part from partselect.com using the model number. I was successful in replacing the part, and we are back to microwave popcorn and quick defrost for a price that was less than a service call, however, it was time consuming, required a large work area, and access to 5 out of 6 sides of the unit. So proceed at your own discretion


The first thing in every set of repair instructions was to discharge (short-circuit) the capacitor, as it may store large (as in lethal) amounts of electricity even when it is not connected to a power source. I had never done this, but found these instructions:

“Discharging your microwave's capacitor is absolutely essential in preventing injury to your microwave, your tools, and yourself. A capacitor stores a large amount of electricity even when your microwave is unplugged, and it must be discharged before beginning any repair.
A capacitor is discharged by creating a short circuit between each of the two capacitor terminals, and between each terminal and the chassis. The chassis is the metal mounting (bare metal surface) of the capacitor. Read these directions thoroughly before you proceed.
With your microwave unit unplugged, touch the blade of a well insulated screwdriver to one terminal. Gently slide the screwdriver forward until it reaches the other terminal, holding it there for a few seconds. Be aware that this often results in a loud and startling 'POP'.
Repeat this procedure in order to create a short circuit between each capacitor terminal and the chassis (bare metal mounting plate surface). This same method can be applied to a capacitor having three, and not two, terminals.”
I had not run my microwave in over a week, and then while my part was shipping, left my microwave 'unplugged' for more than two days, and my capacitor apparently discharged itself, although I did go through the above procedure carefully and completely - just in case.
1. You must remove your microwave from the cabinets - it is impossible to repair otherwise. This is best accomplished with 2 strong people - my wife and I made it work, but wished for another guy.
a. While supporting the microwave, remove the two screws coming down through the cabinet above.
b. Lift the rear of the microwave as much as possible, then tilt the front down - there is a clip high on the left side, as well as the hinge/clips on the bottom.
c. If you do not lift it off the wall all at once, you may have to lift the rear even farther to remove it from the hinge/clips on the bottom.
Important Note: Always beware of the microwave door, if it is bent or broken and cannot retain a seal, the microwave not function as a safety feature to keep from releasing microwaves.
2. Remove the vent cover on the top/front of the microwave - be careful, it's plastic.
3. Remove the vent cover and light panel on the bottom of the microwave - this is several screws and some simple wire clips.
4. Remove the "shell" (top and sides) of the microwave - this is several more screws on the back. Make sure to remove the plate that is holding the cord in place on the top.
5. Remove the interface panel by the screws on the top (which had been hidden by the vent cover) - the wires can remain attached, just slide it aside.
6. Remove the metal cover on the right side at the rear; this will expose the Magnetron and the Capacitor. Remember to immediately test and discharge the capacitor!

7. After you discharge the capacitor, remove the other cover plate and the support bracket - in case you haven't noticed, this is a time and space consuming operation.

8. You

air vent grill was broke (cracked in several places)

  • Customer: Edward from Lehighton, PA
  • Difficulty: Really Easy
  • Time to Complete: Less than 15 mins
  • Tools Required: Screw drivers
  • 71 of 133 people found this instruction helpful
Took apart old grill taking out 2 screws then put new grill in place and reinstalled screws and done.

I broke the glass plate to the microwave.

  • Customer: Rosalina from Madera, CA
  • Difficulty: Really Easy
  • Time to Complete: Less than 15 mins
  • Tools Required:
  • 68 of 130 people found this instruction helpful
The part was sent to me the next day! And it was the right part. Awesome!

Broken Microwave Vent

  • Customer: Barbara from Carmel, IN
  • Difficulty: Really Easy
  • Time to Complete: Less than 15 mins
  • Tools Required: Screw drivers
  • 66 of 127 people found this instruction helpful
The old vent slipped right off because the tabs holding the screws were broken. It took just a few minutes to screw in the new vent. Also, I want to add that I only ordered the part on Friday and it arrived Saturday morning. I wish all repairs were this simple!

Microwave door frame melted when candle placed under it

  • Customer: Carrie from Bristow, VA
  • Difficulty: A Bit Difficult
  • Time to Complete: 30 - 60 mins
  • Tools Required: Screw drivers
  • 36 of 38 people found this instruction helpful
First, I shut off the power to the microwave. Next, I removed the three screws located on the interior edge of the door.

I ran into some difficulty from there. I couldn't figure out how to get the frame off, because there were not any other screws or visible methods of attachment, and the thing wouldn't just be pulled off the door. I didn't want to just yank ithe frame off the door, and have something break.

II looked online for help. I looked in the Whirlpool owner's manual for instructions on removing the frame. (All that for nothing.) So, I called Whirlpool. They told me "only a technician can do that."

I am not sure as to the legitimacy of that statement.. I did not find any technological or safety issue that made me feel this was "so well built", I would never figure it out. In fact, I was suprised at how cheaply they are put together.

I decided to put thin wedges between the door frame and the door. discovered the frame is held on to the door with small "ledges" which can "pop off the door, if jimmied.

I started where the screws had been removed, and I wedged a butter knife blade in there. Then I just put old butter knives (no real cutting edge) and plastic knives all the way around the door, between the frame, and the door itself....and then I pulled firmly, and pop! It came off relatively easy. Well, heads up. Just be sure to put down a large towel or something to cushion the fall of the knives, and to reduce the noise when they fall...

I had a delay inthe repair when I found the glass to the window in the door was stuck to the frame with silicone caulk. But I just peeled off the caulk, and popped the glass out.

Once I got that on in the new frame, the same way I found it on the old frame, I put on the caulking the same way I found it. I let it dry overnight.

The next day, after cleaning the interior of the glass, I popped the frame back on the microwave door, by pushing the little ledges over their "catches"...and viola! I saved myself a very expensive "technician" visit.

Thank you, PartSelect!

Grease filters were missing from the over-the-stove microwave

  • Customer: Lori from Salt Lake City, UT
  • Difficulty: Really Easy
  • Time to Complete: Less than 15 mins
  • Tools Required:
  • 64 of 126 people found this instruction helpful
Why a tenant would remove and discard the grease filters without replacing them is beyond me! But, I removed the filters from the package and slid them into place. Two minutes tops. I would like to add that I ordered these on Thursday afternoon, and I had them on Saturday; awesome customer service!

Broken Microwave Tray

  • Customer: Eric from Puyallup, WA
  • Difficulty: Really Easy
  • Time to Complete: Less than 15 mins
  • Tools Required:
  • 64 of 127 people found this instruction helpful
This is the second replacement tray we have in installed. The first one ( Not From Here ) we had for less than 5 months, we made a bag of popcorn, and about 5 minutes later we heard a crash, not knowing where the noise came from we dismissed it. The next day we opened the microwave a saw the plate had shattered. So we hope that this will not do the same thing.

Grill on microwave was not staying in place

  • Customer: Pete from Saint Joseph, IL
  • Difficulty: Really Easy
  • Time to Complete: Less than 15 mins
  • Tools Required: Screw drivers
  • 63 of 124 people found this instruction helpful
Took off old grill and replaced with the new grill. This is very easy. I am pleased with the service from your company. Parts arrived very quickly.

Dirty filters

  • Customer: Susan from Hercules, CA
  • Difficulty: Really Easy
  • Time to Complete: 30 - 60 mins
  • Tools Required: Screw drivers
  • 63 of 127 people found this instruction helpful
It was a simple replacement of grease filter and charcoal filter in microwave/hood combination. I did use a screw driver to pry out the filters, but otherwise no tools. It was easy and straightforward.

Microwave turntable does not work

  • Customer: Todd from San Bernardino, CA
  • Difficulty: A Bit Difficult
  • Time to Complete: More than 2 hours
  • Tools Required: Pliers, Screw drivers
  • 28 of 33 people found this instruction helpful
My unit is a wall mount/cabinet/built-in model. The repair is actually fairly simple once you determine that the actual microwave is just a component of the entire unit, and that it (the microwave) can be easily removed from the unit. I did not figure this out until after I removed the entire unit (disconnect the power supply, lift the entire bulky, heavy unit out of the cramped space in the cabinet, etc). Once I got it out I figured out how easy it is to remove the actual oven - a couple of screws, literally. The unit is a bit bulky, but not particularly heavy and is quite manageable. I did this entire process alone.

I got the oven out, rolled it on it's side and found the plate to access the motor. The plate is located on the bottom/underside of the unit. The plate is nothing more than a section of the underside of the metal housing that has been cut-out as an access point. This "cut-out" is not complete - that is, not completely cut out so as to all the plate to stay in place without the need for screws, etc, until you actually have to use it. I used a pair of dykes to cut the couple of points still connecting this plate, removed the two phillips screws to remove the motor, disconnected the two wires connected, then reversed to complete the repair. You then flip the cut-out plate over/rotate it, and some screw holes line up. Find a couple of small screws, and re-attach the plate to cover the motor.

The actual fix is really easy, again, once you figure out the simple way to remove the oven. I am an idiot, so you will probably find this much easier. I could probably do this repair now, after my experience, in less than 30 minutes (probably less than 15 minutes). I probably save a couple hundred $ by doing it myself so was well worth the time to do it. Good luck.

Humming sound, not heating.

  • Customer: Fausto from Miramar, FL
  • Difficulty: Easy
  • Time to Complete: 15 - 30 mins
  • Tools Required: Nutdriver, Pliers, Screw drivers
  • 24 of 31 people found this instruction helpful
I turn off the income electricity by shutting down the corresponding circuit breaker. Then, I removed the control panel from the microwave which gave me access to the capacitor and adjacent diode. After that i unscrewed the defective diode and replaced it with the new one and BINGO!

Vent grill broke when attempting to remove it to clean, previous owners had broken several tabs off

  • Customer: MARIA from HURRICANE, WV
  • Difficulty: Really Easy
  • Time to Complete: Less than 15 mins
  • Tools Required: Screw drivers
  • 19 of 22 people found this instruction helpful
Removed the old grill. Then loosened the screws on the top of the microwave. Popped the grill in place and tightened the screws. it looks great, works perfectly, and we don't have to replace the unit that we were afraid might be the case.

thanks so much for providing these parts that saved us from buying a new microwave oven.

Microwave made very loud noise while on. No heat.

  • Customer: Sleiman from Miami, FL
  • Difficulty: Easy
  • Time to Complete: More than 2 hours
  • Tools Required: Pliers, Screw drivers
  • 20 of 26 people found this instruction helpful
Unless you have a very comfortable background with electronics and electricity, I don't necessarily recommend taking apart a microwave. If you are very handy and are going to be VERY cautious to follow the rules of discharging caps and testing voltages before moving forward, then go for it. That said, I took the microwave off and apart. Not knowing where to find the parts, I was fortunate that the installer put the instruction book for the microwave inside the front vent slot above the touchpad for reference. it details the location of every part and it tells you very clearly what each part you test should show specific to this microwave on your multimeter. Find this guide online if you don't have it. Turn on the microwave for 20 seconds with a glass of water to make sure it's not heating - that with the noise means it's eeither the magnetron, cap, or diode. Read the notes on this site for all of the basic things to look for with the magnetron, diode, and capacitor. Once comfortable with the guide, locations of those devices, and how to test, then take it down and apart. Unfortunately, I didn't do all those things in that order, and it only wasted a lot of time trying to find the parts. Once I found the parts and put all the screws and covers back for all the areas that didn't need to be accessed for the repair, testing went quickly. The diode was bad. Ordered a new one and had it in 3 days or so. That means your microwave will be apart and sitting somewhere for a little while until you get the part and have time to repair it. Putting the diode back isn't too bad. Reassemble the microwave and put it back up again. If i had to do it again, it would take me 20 to 30 minutes once the microwave was down and on a table. Also, I used some bricks with towels over them or you could use some sawhorses to keep the microwave elevated so you can plug it in and run it after installing the new component. Again, make sure you discharge the cap before touching anything again even if you didn't run it, but just plugged it in.

burned out bulb

  • Customer: john from plainfield, IL
  • Difficulty: Really Easy
  • Time to Complete: Less than 15 mins
  • Tools Required: Screw drivers
  • 20 of 27 people found this instruction helpful
removed two screws,lowered the glass shield,removed the burned out bulb and replaced it with the new one. I ordered the bulb from parts select and recieved it two days later. It was a pleasure to deal with them, and certainly use them again.
All Instructions for the MH7140XFB0
16-30 of 158