Viking Microwave Drawer Stuck or Won't Open:... | appliancefaults.com

Technical Background:

The Microwave Control Unit (MCU) monitors the door switch and controls the door lock solenoid. When the open button is pressed, the MCU checks the door switch status and, if appropriate, sends 120V AC to the door lock solenoid to release the drawer. The MCU receives power from the main power supply within the microwave. Loss of power to the MCU or a malfunction in the door switch circuit can prevent the drawer from opening.

Symptoms:

The Viking microwave drawer is stuck and won't open when the open button is pressed. The display may or may not be functional. The drawer might be making a humming noise, indicating the solenoid is trying to actuate.

Possible Causes:

Faulty door lock solenoid.
Damaged or misaligned door switch.
Control board failure.
Obstruction preventing drawer movement.
Power supply issue to the control board.
Wiring harness issue between the control board and drawer mechanism.

Solution:

1

Unplug the microwave drawer from the outlet, or turn off the breaker at the breaker panel.
2

Inspect the door for any visible obstructions or damage. Clean the area around the door with a damp cloth.
3

Check the door switch continuity with a multimeter. It should show continuity when the door is closed, and no continuity when open. Replace if faulty.
4

Verify the door lock solenoid receives 120V AC when the open button is pressed. If no voltage, suspect control board.
5

Check the wiring harness connecting the control board to the door lock mechanism for any loose connections or damaged wires. Repair as needed.
6

If all other components test good, replace the main control board.
7

Ensure proper drawer alignment after any repairs.

Safety Warning:

Disconnect power (LOTO - Lock Out Tag Out) before attempting any repairs. Microwave ovens contain high voltage components that can cause serious injury or death. Capacitors can hold a charge even when unplugged. Wear appropriate safety glasses and gloves.

Prevention:

Regularly clean around the door to prevent debris from interfering with the door switch and lock mechanism. Avoid slamming the drawer closed.

Expert Tip:

Some Viking microwave drawers have a service mode that can be accessed by pressing and holding certain buttons simultaneously. Consult the service manual for the specific sequence. This mode may allow for manual drawer release.

Frequently Asked Questions

•Where is the door switch located on my Viking microwave drawer?

The door switch is typically located behind the front panel of the microwave, near the door opening. You may need to remove the trim or front panel to access it.

•How can I test the door lock solenoid?

Disconnect the solenoid and use a multimeter set to ohms to measure its resistance. An open circuit indicates a faulty solenoid. Also, verify it receives 120V AC when the open button is pressed.

•Where can I find a replacement control board for my Viking microwave drawer?

You can find replacement control boards from authorized Viking appliance parts distributors or online appliance parts retailers. Have your model number readily available.

Viking Microwave Drawer Stuck or Won't Open: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the door switch located on my Viking microwave drawer?

•How can I test the door lock solenoid?

•Where can I find a replacement control board for my Viking microwave drawer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: