Oven racks or telescopic runners difficult to slide, squeaking or sticking

Safety first: Allow the oven to cool completely before removing racks.

• Remove and clean: Take out all racks and runners. Clean with hot soapy water or a non-caustic oven cleaner. Avoid immersing telescopic runners if the manufacturer advises against it.
• Inspect for warping: Check that racks are straight and not bent. Replace any that are distorted.
• Lubricate (if allowed): Some telescopic runners can be lightly lubricated with high-temperature food-safe lubricant; check Grundig's guidance. Do not use standard oils or greases.
• Replace worn runners: If bearings are rough or seized, replace the telescopic runner set.

Note: Do not operate the oven with runners removed unless the manual confirms it is safe.