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Customer Questions and Answers for High-Voltage Diode Kit (Microwave) by Frigidaire

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Manufacturer Part
4.89 (64)
By: Frigidaire
Part Number: OEM9662217
Manufacturer Part Number: 5303918287

This microwave high-voltage diode kit converts AC to DC in the high-voltage circuit so the magnetron can heat. Replacing a failed diode often restores heating performance. What it does:

  • Rectifies high-voltage AC to DC for the magnetron
  • Completes the high-voltage circuit with the transformer and capacitor
  • Common failure symptoms include running but not heating, loud humming/buzzing, or blowing a fuse/tripping a breaker at start
  • Visual clues can include cracking, swelling, or burn marks on the diode
What's included:
  • One high-voltage diode
Install notes:
  • Disconnect power before servicing; microwaves can retain lethal voltage even when unplugged
  • Properly discharge the high-voltage capacitor before handling components; use insulated tools and approved procedures
  • Note diode orientation/polarity and mounting; install exactly as the original

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Questions & Answers

For Frigidaire High-Voltage Diode Kit (Microwave) (Part Number: OEM9662217)

Ted Krehbiel for Model Number FLSC238DSB

The main water valve makes a loud noise and no water is dispensed as well as the ice maker is not getting water either. Testing the water valve wire harness, the diodes appear to be testing properly using continuity. All common connections have continuity as well. However, when the dispenser lever is pressed, 120v is observed at both the dispenser and icemaker terminals, while the main valve terminal only is carrying 50v. Having normal voltage at both terminals while pressing the dispenser suggests that one of the diodes is shorting, but continuity testing does not show this result. I'm trying to understand if this is a diode, or a power control board issue.

1 Answer

Ted, If there is not 120 vac to the main valve, this would be a control board issue especially when the ice valve is getting power at the same time as the dispenser.

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1 Answer

Karen, the freezer temperature would need to be checked with a thermometer to ensure it is actually below 10°F. If it is, the next step would be rotating the ice maker rake to the 1 o'clock position to manually start a harvest. This will allow the water valve to be tested for 120VAC at the end of the harvest cycle. If the valve does not get voltage, the ice maker 5303918493 would be the most likely cause of failure. If there is voltage, the water filter ULTRAWF would likely need to be replaced if it is older than 4 months.

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Mike for Model Number frigidaire LGUB2642LF4

This is a french door refrigerator with 2 icemakers and a water dispenser. Water dispenser and upper(refrigerator) icemaker work but lower icemaker (freezer) gets no water. Replaced the valve in October and lower icemaker made ice for a while, but now makes a tray every couple weeks. Checked the inlet valve and it all works. It is also A new icemaker. Checked for frozen inlet line. Can the diode kit be my problem. If so, what diode kit works with this refrigerator. If not, what else to check.

1 Answer

Mike, as the ice maker and the water valve are new, it would be recommended that the freezer temperature is checked with a thermometer. After leaving a thermometer in the freezer for several minutes, it can be checked to see if it matches the set temperature. If the temperature matches the set temp, and it is set to be below 10°F, the next step would be to identify if there is an air gap in the gasket that could be allowing warm air into the freezer.

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1 Answer

Hello Frank, please repost your question with the model number so we can locate the correct technical information to assist you.

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1 Answer

Phil, The diode would typically create an issue that when you dispense water through the door it will come out of the icemaker or vice-versa. If the valve does not energize when the dispenser lever is pushed and it hooked up to the ice maker water valve then the issue will most likely be the water valve is at fault.

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1 Answer

Don, the lone tan wire would be where the black meter probe would be placed while the red probe is placed on either of the other two wires while testing for continuity (or diode testing if available). This should show continuity in this manner. When the red probe is placed on the lone tan wire and the black probe on the other two wires, the diode should show as open or infinite.

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1 Answer

Brandon, If there is no obstruction of the water lines then this would most likely be an issue of a faulty icemaker.

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1 Answer

Hello Mike, no, the terminals for the water valve coil are not position sensitive. The problem you are having is being caused elsewhere.

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1 Answer

Nate, Youu will want to cycle the ice maker and check the water valve to see if 120Vac appears at the end of the cycle. Also, check the fill tube and make sure no ice is blocking the path of water.

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1 Answer

Michael, you will want to ensure that all of the air has been removed from the water line. When installing a new filter, you will want to dispense a gallon of water, wait for an hour, then dispense another gallon of water. This ensures that as much of the air is removed as possible because air pockets can diminish the flow of water until they are flushed out.

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