Microwave emits a high-pitched squeal or chirping noise when the turntable rotates.

Steps:

• 1. Remove and clean: Take out the glass tray and support ring. Clean all contact surfaces and wheels with warm soapy water, then dry.
• 2. Inspect wheels: Ensure wheels roll freely and are not flat-spotted. Replace the support ring if worn.
• 3. Check tray: Inspect the glass tray for warping or chips that could cause uneven rotation.
• 4. Light lubrication: If allowed by the manual, a tiny amount of food-safe lubricant on the wheel axles can reduce noise (avoid excess).