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How do I access the rectifier diode for replacement on a Whirpool MDL# MH2155XPT3.

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  • Microwave Ovens Master
  • 9,098 Answers

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

You should also refer to the technical sheet behind the controls, or you can download it here.

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/diode.html
(if it is NOT shorted or burned looking, it's probably fine)


http://www.gallawa.com/microtech/mag_test.html
(continuity can be good even though mag is bad!)


http://www.gallawa.com/microtech/xformer.html

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

Posted on Aug 22, 2010

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1 Answer

Microwave run but won't get hot


If your microwave oven doesn't heat, you may have a problem with the high voltage diode or rectifier. This component helps provide the high voltage that powers the magnetron. The high voltage diode is located near the magnetron and the high voltage capacitor, so access will require removal of the cabinet. Disconnect the power and also discharge the high voltage capacitor to prevent an electrical shock. You can then test the diode for continuity with a multi-meter. Diodes are polarity specific and you should see low resistance with the meter leads in one direction and higher resistance when the meter leads are reversed. Most multi-meters will have a special setting for diodes or rectifiers. If the high voltage diode shows low resistance in both directions or shows no continuity at all, then it will need to be replaced. If you find the high voltage diode tests okay, then you will need to determine whether power is being supplied to the circuit. This is a high voltage circuit and further testing should only be performed by a qualified technician.

Jan 06, 2018 | Microwave Ovens

1 Answer

Sears sent me a diode for hotpoint microwave and a video for replacement and the video is different. Can't find the diode for MY Hotpoint rvm1435bk01 to see if it's the same to replace.


Most microwave diodes will work just fine from system to system. The most common ones I use are rated at 550ma. When you check your old diode what made you think it was bad? They are such a high rating you will not get a reading on it with a regular ohm meter. Mostly on HV rectifiers if it is not shorted ( Zero Ohms) it is probably good. If you have no high voltage then substitute it and see if you do get high voltage, then you know it was open. Follow the video and give it a try.

Aug 12, 2017 | Hotpoint Microwave Ovens

1 Answer

The microwave comes on and seems to cook but does not cook . It makes a very loud humming noise and the turntable goes around but there is no heat to cook anything.


you either have a bad magnatron, that is trying to heat but won't or you could have a capacitor or diode (rectifier) that is bad. if you order a magnatron replace capacitor and diode (rectifier)

Feb 24, 2011 | Kenmore Microwave Ovens

1 Answer

I have a sharp microwave, model #R-1470. It's about 14 years old. I went to use it and it sounded like a power surge and then lost all power. I checked the electrical outlet and it has powere to it. Is...


We have a similar model's service manual at our site which will help you, but note that the part numbers will not be the same.

It's here: http://031d26d.namesecurehost.com/mwd//r1480_r1481_r1482_sm.pdf

If I had to bet, I would say the high voltage rectifier diode or high voltage capacitor shorted and blew the fuse.

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
(if it's not shorted or burned, it's probably okay)


http://www.gallawa.com/microtech/cap_test.html

Once you replace the fuse (15A or 20A fuse available at hardware stores, etc.), if it goes dead again almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

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

If it runs fine but won't heat, you have a bad high voltage rectifier diode and/or magnetron.

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

You can order Sharp parts from Encompass here or you can call them toll-free at 866-779-5835.

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

Oct 02, 2010 | Sharp R-1470 Microwave Oven

1 Answer

Microwave was running fine. Suddenly "running humming sound" dropped to a loud, deeper humming, almost vibrating sound. I opened the door and the oven had a horrible smell. Is it fried and in need of...


You have a failed high voltage transformer, magnetron, or high rectifier diode, or possibly both of the last two.

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

The service manuals you need are here:

http://031d26d.namesecurehost.com/mwd/r1490_r1491_r1492_sm.pdf

http://031d26d.namesecurehost.com/mwd/r1480_r1481_r1482_sm.pdf

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

You can order parts from Encompass here or you can call them toll-free at 866-779-5835.

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

Oct 02, 2010 | Sharp R-1490 Microwave Oven

1 Answer

S/n 142627 Model nr. R-1406 over cabinet microwave. Does not heat, turntable turns, light comes on, but does not heat.  All buttons work. , Have tried pressing fan button.  It works but no...


This is probably a shorted high voltage rectifier diode, a bad magnetron, or maybe just a bad connection at the magnetron.

We have a sound clip here of what a microwave should sound like when the cooling fan and high voltage section are working.

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

The service manual is at our site here.

Accessing some part will require you to remove the oven from the wall, and the installation instructions (found here) makes that much easier.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/diode.html
(if it is NOT shorted or burned looking, it's probably fine)


http://www.gallawa.com/microtech/mag_test.html
(continuity can be good even though mag is bad!)


You can order parts from Encompass here or you can call them toll-free at 866-779-5835.

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

Nov 27, 2009 | Sharp Microwave Ovens

2 Answers

Microwave has a strange oder ( electrical possibly ??? ) and is no longer heating food. It is a ge spacemaker 1400


It may be a bad magnetron, high voltage rectifier diode, or high voltage transformer.

We have a sound clip here of what a microwave should sound like when the cooling fan and high voltage section are working.


A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/diode.html
(if it is NOT shorted or burned looking, it's probably fine)


http://www.gallawa.com/microtech/mag_test.html
(continuity can be good even though mag is bad!)


http://www.gallawa.com/microtech/xformer.html

You can find links to helpful exploded view diagrams and part ordering help here. I'd recommend that your bookmark this link to your favorites.

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.

dee77f7.jpg

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) for testing and possible replacement will require you to remove the oven from the wall and take off the outer cover.

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.

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

Nov 27, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Sounds like a truck engine braking. Sometimes like a buzzer at a basketball game.


With the symptoms you have, I would most strongly suspect a shorted high voltage rectifier diode or a bad magnetron.

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.


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

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
(if it's not shorted, it's probably okay)

http://www.gallawa.com/microtech/mag_test.html
(even if the magnetron passes these tests, it can still be bad. If you have high voltage and the diode is good, assume the magnetron is bad)

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

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.

dee77f7.jpg

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

Oct 06, 2009 | Maytag MMV4205 Microwave Oven

1 Answer

Rectifier going bad


Replace the capacitor and diode together as the capacitor is probably failing, causing the diode to fail.

The only other reason the diode could be failing is the magnetron is pulling too much current, but I doubt it.

Mar 05, 2009 | Frigidaire PLMV168 Microwave Oven

1 Answer

Panasonic microwave buzzing noise


Yes, this is usually a shorted high voltage rectifier diode.

It is usually located behind the high voltage transformer and it attaches to the magnetron and to the chassis.

For ciritical safety links how to test the diode, see: http://www.gallawa.com/microtech/diode.html
Panasonic replacement parts can be found here: http://www.pasc.panasonic.com/epartr

Dec 06, 2007 | Microwave Ovens

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