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MW4370W Samsung Microwave - Overview

Diagrams for MW4370W

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Parts for the MW4370W

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High-Voltage Diode – Part Number: DE91-70063D
$28.26
In Stock
High-Voltage Diode
★★★★★
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(4)
Part #DE91-70063D
This high-voltage diode is designed for use within various makes and models of microwaves and is a genuine OEM part that converts alternating current (AC) into direct current (DC). If you notice your microwave turns on and starts but does not heat anything, this diode is likely responsible. You can check the continuity of the diode with a multimeter before outright replacing it, but it is important to remember that doing any repairs on a microwave and dealing with sensitive electrical components should be done carefully and with the appropriate precautions to avoid any hazards. To replace the high-voltage diode in your microwave, disconnect it from power and allow it to discharge. Using the appropriate screwdrivers, gain access to the control panel of the microwave. Using an insulated screwdriver, release any electrical charge in the capacitor by touching it across the terminals. Then you can remove any hardware securing the diode, including the harness connecting it to the capacitor, which may be easiest done with pliers. Connect the new diode to the capacitor terminal and the securing bracket, and then reassemble your microwave before connecting it to power again.
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Button Spring – Part Number: DE61-70076A
$28.33
In Stock
Button Spring
Part #DE61-70076A
Synchronous Motor – Part Number: DE31-10154D
$56.94
In Stock
Synchronous Motor
Part #DE31-10154D
Thermostat – Part Number: DE47-20009A
$28.12
In Stock
Thermostat
Part #DE47-20009A
Microwave Glass Tray – Part Number: DE74-20102D
$66.94
Special Order
Microwave Glass Tray
Part #DE74-20102D
Incandescent Lamp – Part Number: 4713-001102
$26.23
Special Order
Door Lever – Part Number: DE66-90013A
$31.58
On Order
Door Lever
Part #DE66-90013A
Cartridge Fuse – Part Number: 3601-001197
$25.95
In Stock
Cartridge Fuse
Part #3601-001197
Low Voltage Transformer – Part Number: DE26-20144A
$88.96
Special Order
Low Voltage Transformer
Part #DE26-20144A
Thermostat Assembly – Part Number: DE47-20008A
$35.63
In Stock
Thermostat Assembly
Part #DE47-20008A
Coupler – Part Number: DE67-60002A
$8.75
Special Order
Coupler
Part #DE67-60002A
Assembly GUIDE ROLLER;MW4370 – Part Number: DE92-90436A
No Longer Available
Assembly GUIDE ROLLER;MW4370
Part #DE92-90436A
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Questions And Answers for MW4370W

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Sorry, we couldn't find any existing answers that matched.Try using some different or simpler keywords, or submit your new question by using the "Ask a Question" button above!
Ronald - For model number MW4370W
December 1, 2023
Is the "Assembly roller guide" the wheel s under the glass dish? No image was available.
Chris Boyle Profile
Hello Ronald, thank you for asking. No, it is not. The Roller Guide is PS4236280. We hope this helps.
No Longer Available
Assembly GUIDE ROLLER;MW4370
1 person found this instruction helpful.
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Common Symptoms of the MW4370W

How this model fails, and the parts that fix it.

No heat
Fixed by
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Buzzing noise, no heating of food
22 of 35 people found this instruction helpful.
  • Ted from Hudson, NH
  • Easy
  • 30 - 60 mins
  • Pliers, Screw drivers
Removed control panel, discharged HV capacitor. Removed old diode, tested to confirm failure. Replaced part. Other than the removal of the panel swapping the part was almost as easy as replacing a light bulb.
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Appears to work, but food not heated
20 of 48 people found this instruction helpful.
  • Joel from CAMBRIDGE, MA
  • Difficult
  • 1- 2 hours
The high voltage tired was shorted. I replaced it with a new one, but that did not solve the problem.

You can test the high voltage tired with a voltmeter and a 9 V battery. Search Search for it on YouTube.

You can also test the high voltage capacitor, the high-voltage transformer, and the magnetron with a multi met er. Search for the procedures on YouTube.

I tested all these high-voltage components with a low-voltage multi meter, and they all checked out OK (after replacing the diode). However the microwave still did not heat food.

When working on a microwave it is important to unplug it and also discharge the high voltage capacitor. The capacitor has a 10 megaohm resister to automatically discharge itself, but it may have failed – – so discharge it manually.

In the end I ordered a new microwave.
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Microwave stopped working - would not heat up
11 of 21 people found this instruction helpful.
  • louis from PARRISH, FL
  • Easy
  • 1- 2 hours
  • Pliers, Screw drivers
I removed the outer cover and exposed the inner workings. I watched a video on partselect.com to show how to remove and replace the Diode. I followed the instructions and it was very easy to replace.

Unfortunately, the diode was only part of the issue. I ended up replacing the High Voltage capacitor and Magnetron also. Those w ere a little more complicated but still easy to do.

Now the Microwave works just like new! Cost me less than $100 for all parts.
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