Oven rails or telescopic runners are difficult to slide or make grinding noises.

Safety first: Ensure the oven is cool before removing racks or runners.

Step-by-step checks:

• Remove and clean: Take out the side racks and telescopic runners. Soak in warm soapy water and clean thoroughly.
• Lubrication: Only if specified by V-ZUG, apply a small amount of high-temperature food-safe lubricant to moving parts. Many runners are maintenance-free and must not be oiled.
• Replace runners: If movement is still rough or the runners are bent, replace them with new V-ZUG telescopic runners.

When to call a technician: Not usually necessary; this is typically a user-serviceable issue.