Microwave interior light and fan run, but the turntable does not rotate; no error code.

Safety: Unplug the microwave before handling internal parts.

User-level steps:

• Remove and inspect: Take out the glass tray and roller ring. Inspect the turntable coupler for cracks or wear.
• Clean: Clean the cavity floor and roller ring to remove grease and debris.
• Test without load: With the tray removed, run the microwave briefly and observe if the coupler turns. If it does not, the motor may be faulty.

Technician-level steps:

• Access the underside of the cavity to reach the turntable motor.
• Test the motor for continuity and replace if open or seized.
• Replace the coupler or roller ring if physically damaged.