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Microwave Hood Model #401.80099700 internal fuse blowing

Have a Microwave Hood Model #401.80099700. Installed 2 months ago. On a separate 20 amp breaker. First time we ever used it, were cooking corn-on-cob. After 1st batch cooked, microwave went dead. Several Hours later it was OK. Checked the breaker for the outlet, it was not tripped. Tonight, cooking corn-on-cob. Exact same thing. Second batch of corn, microwave dies. Breaker is fine. Happened 1.25 hrs ago, microwave still not back up.

WHY???

Is this a known problem or do we just have a faulty microwave?

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6 Suggested Answers

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Posted on Jan 02, 2017

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MicrowaveSvc
  • 9085 Answers

SOURCE: Microwave Oven Interior Paint

Yes, but if this is not fixed, it may flake off and get in your food, or allow grease or food particles to build up on the surface.

 

The loose paint should really be sanded off, at least.

 

Then when it's clean and dry, you can apply a little high-temperature appliance paint, available from department stores, home improvement centers, and appliance parts stores.

Posted on Oct 12, 2007

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MicrowaveSvc
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SOURCE: Microwave Trips Breaker and Blows Fuse when not in Use

Since the internal fuse blew, the problem has to be either a surge from the power source, or an intermittent or transient short at some point beyond the fuse. With the unit unplugged, I would first look at the varistor (surge absorber) on the control circuit board to see if it might have taken a transient. It may look charred, distorted, etc. Then I would look at the door interlock switches and mounts to see if the switches are clicking properly and if they are aligned and secure. The purpose of the monitor switch is to blow the fuse (and usually the breaker) if there is aan interlokc problem. Next would be a look at the condition of the wiring from the fuse holder all the way back to the power cord. Then just for good measure, I would test the power outlet. A toaster is a good high-current load to use. But I don't think the problem's in the wiring or breaker. If you or a friend decide to work on it, we have *critical* safety and disassembly info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find the wiring diagram, helpful exploded view diagrams and order parts by entering your base model number (without the suffix) here: http://tinyurl.com/gv383 Be sure to use a proper ceramic appliance fuse that's meant for the job.

Posted on Mar 13, 2007

  • 19 Answers

SOURCE: Ge Spacemaker microwave jvm240 wv Micro hood combo.

sounds to me like the magnatron has shorted out. i don't know of a way to test them unless you have some high dollar equipment. a continuity test prob wont tell you anything. what reading did you get on the cap when you tested it?

Posted on Jan 06, 2008

MicrowaveSvc
  • 9085 Answers

SOURCE: LG microwave model MV1526B

The pop leads me to suspect that the high voltage rectifier diode blew.

We have the service manual for this model and have uploaded it to our site here to help you. You will need the free Adobe Reader to view or print it.

A microwave can be dead for many reasons.

It may be the fuse, which is usually located on the floor of the oven behind the control panel or between the door switches.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

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.

You can usually 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.

Posted on Aug 08, 2008

MicrowaveSvc
  • 9085 Answers

SOURCE: Kenmore Microwave Oven Sudden Power Reduction

I would be sure to check the microwave's outlet under a load.

One good way is to use a toaster or hair dryer for about a minute to see if they run at full power and run without their heating elements dimming.

If the power at the outlet is steady, I would suggest a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If it still fails to heat properly, I would say you have a failing magnetron, and it would just be a coincidence that the failure began after the new wiring was installed.

If you need to order the magnetron, Sears sells it for $73.13, but you can get it for $41.84 here.

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

Posted on Feb 15, 2009

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Blowing breaker


In general house hold circuit breaker of the house is 15 Amps or 20 Amps.

Either you have defected (weak) circuit breaker and wiring or bad Microwave oven.

The 99.99 % house hold Microwave ovens pull less than 15 Amps. They may have internal ceramic 15A fuse or 15 Amp internal circuit breaker.

To isolate your problem:

1. Plug your Microwave oven to different areas (different electrical circuit) if the different circuit breaker still trips... your Microwave oven has a short - Most of them has a small ceramic fuse 15 amps fuse.-also check some inter lock switches at door .

2. If the Microwave oven works Ok then you may have:

2a. You may overload the existing electrical circuit, try to unplug some other appliances

2b. You may have bad electrical outlet receptacle (Replace it with the same type , - may need helps from licensed electrician)

2c. Weak or defect house hold circuit breaker. (Replace it with the same type , brand - may need helps from licensed electrician)


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Assuming your power line voltage is okay, it would not surprise me that after 27 years, your high voltage capacitor is drying out and increasing its capacitance. This will cause variance in the high voltage output, which can stress the magnetron and increase current consumption.

You can order Whirlpool parts my model number here.
http://tinyurl.com/gv383

For more free DIY and other help & advice, feel free to contact me via my site.

William E. Miller, AS-EET
http://www.microwavecontrol.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"

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Microwave keeps blowing fuse


If it went dead almost immediately after pressing the Start pad, that\'s usually a shorted high-voltage capacitor.



If it went dead a few seconds after pressing the Start pad, that\'s usually a failing high-voltage transformer.



Here are some links with info on part testing:



http://www.microtechfactoryservice.com/cap_test.html
http://www.microtechfactoryservice.com/diode.html
http://www.microtechfactoryservice.com/mag_test.html
http://www.microtechfactoryservice.com/xformer.html




You can usually find helpful exploded view diagrams and order parts by
entering your full model number here: http://tinyurl.com/gv383



Please write back with your brand and model number if you need further help.



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

Jan 03, 2008 | Microwave Ovens

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