Amana Microwave Turntable Grinding Noise or Not... | appliancefaults.com

Technical Background:

The microwave control unit (MCU) sends a low voltage signal to the turntable motor relay. This relay closes, sending 21V AC (typical) to the turntable motor. The motor then rotates the turntable via a coupler. A defective motor, faulty coupler, or control board issues can disrupt this process.

Symptoms:

The Amana microwave turntable is making a loud grinding noise during operation. The turntable may also be completely stationary and not rotating at all when the microwave is turned on.

Possible Causes:

Turntable motor failure.
Turntable coupler damage or misalignment.
Damaged or worn turntable support roller.
Foreign object obstructing the turntable rotation.
Faulty turntable motor control circuit on the main control board.

Solution:

1

Unplug the microwave from the 120V AC outlet.
2

Remove the microwave cabinet (refer to the service manual for your specific model). Use a 1/4-inch nut driver to remove screws.
3

Locate the turntable motor. It's typically located underneath the oven cavity.
4

Disconnect the wires to the turntable motor. Use a multimeter to test the motor for continuity. A reading of infinite resistance indicates an open motor.
5

Visually inspect the turntable coupler for cracks or damage. Replace if necessary.
6

If the motor has continuity, check the voltage supply to the motor when the microwave is running. You should see approximately 21V AC.
7

If the motor is receiving voltage and the coupler is good, replace the turntable motor.

Safety Warning:

Always unplug the microwave before performing any repairs. Microwaves contain high voltage components that can cause serious injury or death. Lock Out/Tag Out (LOTO) procedures must be followed. Capacitor discharge is a must.

Prevention:

Regularly clean the inside of the microwave to prevent food debris from interfering with the turntable mechanism. Avoid placing excessively heavy items on the turntable. Annually inspect the coupler for wear.

Expert Tip:

Some Amana microwaves have a service mode that allows you to test individual components like the turntable motor. Consult the service manual for the activation sequence (e.g., pressing certain buttons in a specific order).

Frequently Asked Questions

•What is the correct replacement part number for the turntable motor on my specific Amana microwave model?

You'll need to locate the model number of your microwave (usually found on a sticker inside the door frame) and then search for the correct motor part number using an appliance parts retailer website or your Amana service manual.

•How do I safely discharge the capacitor in the microwave before working on it?

The high-voltage capacitor stores a dangerous electrical charge even after the microwave is unplugged. Use an insulated screwdriver with a well-insulated handle to short across the capacitor terminals. Exercise extreme caution.

•What is the tolerance range for the 21V AC supply to the turntable motor?

Generally, a tolerance of +/- 10% is acceptable. So, a range of approximately 18.9V AC to 23.1V AC is considered normal.

Amana Microwave Turntable Grinding Noise or Not Spinning: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct replacement part number for the turntable motor on my specific Amana microwave model?

•How do I safely discharge the capacitor in the microwave before working on it?

•What is the tolerance range for the 21V AC supply to the turntable motor?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: