Don't worry, your lumbar support is presumably not defective. However, there are a few tricks to consider when adjusting the lumbar support. You can think of the adjustment module as a kind of 2-speed gearbox with 2 cogwheels:
1st gear (push handwheel in)
Neutral (pull handwheel)
2nd gear (pull the handwheel a little further and make a slight turning movement)
In 1st gear you can adjust the “strength” of the lumbar support, i.e. how pronounced the bulge in the lumbar area should be. In neutral, the handwheel turns without resistance and nothing happens. In 2nd gear, you can then adjust the height of the lumbar support in order to bring the curvature to the ergonomically correct position. If you do not feel any change when turning the wheel, you are probably in “neutral” and need to pull the handwheel outwards again with considerably more force.
However, it also helps to slightly loosen the two screws that secure the control to the chair. This makes it much easier to pull the handwheel out into the last gear. This is due to the fact that the screws are often tightened too tightly, which disconnects the Bowden cables. The adjustment then does not work or only works to a limited extent.
Occasionally, the screw of the rotary knob itself may have loosened. Fortunately, you can easily retighten this yourself:
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