Question about Whirlpool MH7140XF Microwave Oven

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Small fire n microwave

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Had a small fire and now microwave and now wont power up. I disassembled case to access fuse,ran a continunity test on old fuse and indicates continuity. Bought new fuse for $#%^& and giggles and still no power to microwave. I did check circuit breaker additionally i plugged it into another outlet and i still having the same problem. I understand the thermostst but dont want to proceed because i know that a thermostat wont dictate power?????? please help

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I have a small whole in my microwave that causes a little spark of flame everytime I turn it on...can it be fixed?

Posted on Nov 14, 2009

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Check mains supply at control circuit, and check all the high voltage circuit diode and condencers and magnetron.

Posted on Dec 20, 2007

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1 Answer

Why is microwave not heating


The most common problem with my microwaves have been a blown fuse. Unplug the microwave from the wall, take the screws found on the back or sides of the cabinet and pull off the cabinet and look for a fuse. Pull the fuse out and test it with a ohm meter or continunity meter. If you don't have a meter go to Ace Hardware or other home improvement center and get a new one and see if that fixes it.

Oct 12, 2014 | Hamilton Beach 1.1 Cu. Ft. 1000-Watts...

3 Answers

Had a bag of chicken burn up and the microwave stopped and will not turn on.No lights,no sounds,nothing.


Depending on the model, there will be either a thermal cutout or thermostat on or near the magnetron. There is also one on top of the oven chassis ceiling, but under the outer cover.

The latter device acts as a flame sensor that cuts power to the oven in case of a fire.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

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

Accessing some components (especially the oven cavity thermostat / thermal cutout) for testing and possible replacement will require you to remove the oven from the wall.

If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.

You can download GE owner's manuals and installation instructions here.

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

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

Jun 20, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Not turning on has no power


If the model number is correct, there is a 125V, 20 AMP line fuse inside the microwave. Its usually mounted on a small input line filter board at the point where the power cord enters the back of the unit. You will need to UNPLUG the microwave oven and remove the exterior case to access. The case comes off in various ways depending on manufacture and model. I found this illustration at pcappliancerepair.com based on the model number you listed this question under:


http://pcappliancerepair.com/model-display.php


The line fuse is listed as item 47.

You can usually purchase a box of fuses at a hardware store for just a little more than what the manufacturer charges for a single fuse. 125V, 20AMP Slow Blow fuses are recommended.

If you have any questions, or need additional assistance troubleshooting, please post back and let me know. I hope you find this information helpful.

NOTE: Make sure you take any resistance readings with the microwave UNPLUGGED and the component under test isolated (removed) from the circuit.

Apr 27, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Where is the fuse located?


If the model number is correct, there is a small input line filter board with a 125V, 20 AMP line fuse inside the microwave. Its usually mounted on a small input line filter board at the point where the power cord enters the back of the unit. You will need to UNPLUG the microwave oven and remove the exterior case to access. The case comes off in various ways depending on manufacture and model. I found this illustration at pcappliancerepair.com based on the model number you listed this question under:

http://pcappliancerepair.com/model-display.php


The line filter is listed as item 1420. The fuse will be mounted to this board.

You can purchase replacement fuses at any hardware store. You can usually purchase a box of fuses at a hardware store for just a little more than what the manufacturer charges for a single fuse. 125V, 20AMP Slow Blow fuses are recommended.

If you have any questions, or need assistance troubleshooting, please post back and let me know. I hope you find this information helpful.

NOTE: Make sure you take any resistance readings with the microwave UNPLUGGED and the component under test isolated (removed) from the circuit.

Apr 24, 2010 | GE JES1290 Convection/Microwave Oven

1 Answer

How to change the fuse (can't figure out how to find it) in our JVM 1860 SF 001 GE microwave? help please


There is a 125V, 20 AMP line fuse inside the microwave. Its usually mounted on a small input line filter board at the point where the power cord enters the back of the unit. You will need to UNPLUG the microwave oven and remove the exterior case to access. The case comes off in various ways depending on manufacture and model. Searspartsdirect.com has some excellent exploded view parts illstrations you can use to assist you in component location and assembly:

http://www.searspartsdirect.com/partsdirect/showSubComp.pd?imageUrl=http%3a%2f%2fc.searspartsdirect.com%2flis_png%2fPLDM%2fG4090153-00001.png


If the model number is correct, the fuse is listed as item 74 in this parts illustration.


If you have any questions, or need assistance troubleshooting, please post back and let me know. I hope you find this information helpful.

NOTE: Make sure you take any resistance readings with the microwave UNPLUGGED and the component under test isolated (removed) from the circuit.

Apr 19, 2010 | GE JVM1860 Microwave Oven

1 Answer

Microwave doesn't work after house fuse blew


Check the fuse inside the microwave. Unplug the power, remove the case screws on the back of the main case and slide the case toward the back. Remove the outer case and look for a fuse that looks simular to an old automotive fuse, usually near or just above the control panel. Check the fuse to see if it is good, if not replace with the same and reassemble reversing method used to access the fuse. Note: automotive fuses will not work. A replacement will be available at The Shack or a local appliance parts store.

Nov 09, 2009 | Microwave Ovens

2 Answers

Ran on power for 10 minutes, thought it was on timer.


First, check the fuse usually located above the display, inside the top lid.  You can't see if it's blown, so you must test it for continuity with a meter or self powered test light.  Usually fifteen amp, and of the ceramic variety.  (available at radio shack type places) If the new one blows instantly, it's likely a door switch shorted out.  If it blows after a few seconds, it could be the magnetron gone bad, or internal arcing.  The main transformer will sometimes short out, but that's rare.   Be absolutely careful, should your fingers venture around the magnatron connections down below, as there is high voltage and current that can kill you.  This warning applies even when it's unplugged!
The door switches operate together, so if one slams the door shut it will often blow the fuse with no other damage.  Sometimes the crow-bar switch will sustain damage in the process.  Usually, if the switches click individually, they're good.  If one doesn't click, it'll almost always be shorted.  They're located behind the door catch, inside the unit beside the display board, and a bit hard to access.  You will need to reach past the magnatron for this, so be careful.  

Jul 15, 2009 | Whirlpool GH6177XP Microwave Oven

2 Answers

Changing a fuse in a Galanz 700W Microwave Oven


A microwave casing can be removed and almost full access to the electronics with about 6 screws.... make sure to unplug it from the wall first.

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Sep 04, 2017 | Microwave Ovens

2 Answers

Whirlpool GH518XP


Sounds like it got hit with a power spike which could have burned out the low voltage components, (Control panel). How's your insurance coverage?

May 22, 2008 | Whirlpool GH5184XPQ Microwave Oven

1 Answer

Small fire in above range microwave, now completely dead.


It probably put too much heat in the "innards" of the microwave and probably opened the thermostat or thermal fuse located inside -either on the chassis of the microwave or or the magnetron. If you or a friend is handy and wants to check and replace it, it's not a hard job as long as you play it safe. It will look something like the attached photo. In my profile you can find a link to my site where you can find critical safety & disassembly tips. There will be numbers on the side indicating the temperature and you can take the old one to a local appliance parts store to get a new one. NOTE: The one for the hood fan will read open at room temperature, so don't confuse it with the other two thermostats, which will read closed at room temperature. Post back if you need more help.

Dec 23, 2006 | Whirlpool MH7140XF Microwave Oven

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