Question about Panasonic NN-H275 Microwave Oven

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Jenn-Air JMC7000ADB Microwave keeps blowing fuses.

The fuse will blow near the end of the heating cycle. I have replace it twice. It worked for a couple of days on the first replacement and less than a day on the second. Usual time use is 60 seconds or less. Can you suggest an order for replacing parts?

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5 Suggested Answers

MicrowaveSvc
  • 8820 Answers

SOURCE: jenn AIR JMC7000ADB

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 and we'd appreciate your thoughtful rating of our answer.

Posted on Jul 23, 2008

MicrowaveSvc
  • 8820 Answers

SOURCE: timer comes on microwave does not

When you hit Start to cook, do the inside light, cooling fan, and turntable come on?

I'm betting they do not, and that you have a defective bottom door switch or its mount is loose or broken.

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.

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.

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

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.

If you don't find yours, or if you want to look at it without disassembling the oven, you can download it here.

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

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases in about a week or so.

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

Posted on Dec 25, 2008

wiznet2000
  • 86 Answers

SOURCE: keeps blowing fuses

This problem is just like my own microwave, replace the shorted HV capacitor

Posted on Jul 27, 2009

Daniel S
  • 4323 Answers

SOURCE: My NN-S540BF microwave control panel

Hi
If door is locking then either the touch pad or control panel has gone bad and needs to be replaced. Hope this helps...please post back for further assistance.
Daniel

Posted on Sep 23, 2011

  • 6771 Answers

SOURCE: Panasonic microwave NNP295SF shuts off after 15 seconds

It is going to be one of three things, the magnetron, " heart of the microwave oven " the inverter board, " if 7 years or less" and finally the keypad control board. In order to break this down, it will require testing to narrow the field. But what ever choice is made, the parts and labour are going to be the big factor when it comes to cost.

Posted on Apr 19, 2012

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See these links before proceeding:
http://031d26d.namesecurehost.com/mwd/safety.txt
http://031d26d.namesecurehost.com/mwd/disassembly.txt


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.

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