Is the turntable properly installed and operating properly?
A thumping or rumbling sound may occur in the microwave oven if the turntable is not installed correctly or if the support roller assembly is not operating properly.
The turntable can rotate in either direction to help cook food more evenly. Do not operate the microwave oven without having the turntable in place and turntable support working properly.
To Install the Turntable:
1. For new installations, make sure all packaging and shipping tape has been removed from the turntable hub.
2. Place the support on the microwave oven cavity bottom.
3. Place the turntable on the support. Fit the raised, curved lines in the center of the turntable bottom between the three spokes of the hub. The rollers on the support should fit inside the turntable bottom ridge.
Ensure the Turntable Support Roller Assembly is Operating Properly:
Remove and clean turntable support and rollers.
Replace turntable support.
Place one cup (250 mL) of water on the turntable in a microwave safe measuring cup; then restart microwave oven.
Verify microwave oven operation.
Note: Replace turntable immediately after cleaning. Do not operate the microwave oven without the turntable in place.