In the case of a defective lift-and-slide door, the rollers and the lock are often the culprit. When replacing these systems, you can choose from two types of gu running wheels with a rebate height of 45 millimeters or 57 millimeters.

The rebate height of the running wheel is the size of the slot in which the running wheels are mounted. This slot is located at the bottom of the sliding door. The video below shows you how to do that