A turntable that will not rotate leads to uneven heating. The causes are simple and mostly cheap.
Reseat the Tray and Roller
The glass tray and roller ring can sit off their hub.
Fix: Lift both out and refit the tray squarely onto the drive coupler.
Replace the Drive Coupler
The plastic coupler that turns the tray wears down and slips.
Fix: A new coupler is an inexpensive part.
Check the Turntable Motor
If the coupler is fine but nothing turns, the small motor under the floor has failed.
Fix: A technician can replace the turntable motor.
Not sure what's wrong? Book online — every visit includes a free diagnosis.