the turntable won't spin at all, it just sits there and my food cooks unevenly

Diagnosis

The failure of the turntable to rotate in the Farberware FMO11AHTBKB is typically caused by a mechanical disconnect between the drive motor and the glass tray. In most cases, the culprit is the drive coupling—the small, D-shaped plastic piece that sits atop the motor shaft. If this plastic part cracks or strips, the motor will continue to spin internally, but the physical energy never reaches the tray, leaving your food to develop "cold spots" because the microwave energy is concentrated in fixed patterns. Another common cause is a misalignment of the roller ring. If the wheels of the plastic guide ring have jumped their track or if debris (like dried pasta or spilled sauce) has hardened under the ring, the friction becomes too great for the small motor to overcome. You can confirm this by listening closely during operation; if you hear a faint humming or clicking sound coming from the bottom of the oven while the tray remains stationary, the motor is likely functional, but the coupling is stripped. If there is absolute silence, the motor itself has likely suffered an electrical failure.

How to Fix It

Follow these precise steps to restore rotation to your microwave:

1. Open the door and remove the glass turntable tray entirely.
2. Lift out the plastic roller guide ring. Inspect the wheels for any melted plastic or food debris that may be jamming the rotation. Clean the floor of the microwave with a damp cloth to ensure a smooth surface.
3. Locate the drive coupling (the plastic pronged piece) in the center of the oven floor. Try to rotate it gently with your finger. If it spins freely without any resistance from the motor shaft below, the coupling is stripped and must be replaced.
4. If the coupling is intact, place the roller ring back into the oven. Ensure the wheels are seated perfectly flat and centered.
5. Lower the glass tray onto the coupling. It is critical that the notches on the bottom of the glass tray lock precisely into the prongs of the drive coupling. If the tray is slightly off-center, it will not engage and will simply sit still.
6. Run a 30-second test cycle with a glass of water to verify the rotation is smooth and consistent.

If That Didn't Work

• Replace the Turntable Motor: If the coupling is fine but the tray won't move, the synchronous motor beneath the chassis has failed. You will need to unplug the unit, remove the outer cabinet screws, and swap the motor. Ensure the new motor matches the RPM and voltage specifications of the original Farberware part to avoid overheating.
• Inspect the Roller Ring Bearings: If the plastic wheels on the roller ring are flat-spotted or cracked, they create too much drag. Replace the roller ring assembly. A worn ring can cause the tray to "stutter" or stop entirely after a few rotations.
• Check for Floor Warping: In rare cases, overheating from oversized containers can slightly warp the plastic floor of the microwave. Use a straight edge to ensure the floor is level; if it is bowed, the roller ring cannot maintain contact with the drive coupling.
• Verify Door Switch Engagement: While rare for just the turntable, if the microwave is heating but not spinning, one of the door interlock switches may be failing to send the "start" signal specifically to the motor circuit. Clean the switch plunges with electronic contact cleaner.

Heads Up

• Avoid using oversized or extremely heavy cookware that exceeds the weight limit of the glass tray, as this puts excessive torque on the plastic coupling and will strip the gears.
• Clean the area under the roller ring weekly; accumulated grease and food particles act like glue, slowing the motor and shortening its lifespan.
• Never force the glass tray to rotate manually in the opposite direction, as this can snap the plastic teeth of the drive coupling.
• Always ensure the microwave is placed on a completely level surface to prevent the tray from sliding off the coupling during high-speed rotations.