This is to resolve a common issue of the chair unable to lift or descend.
It’s a small issue that can be solved by the user if the gas cylinder is working.
First look at the gear box below.
A closer look, this is how it should fit.
The problem is this wire isn’t connected properly.
A closer look at the wire.
When you pull the control knobs, it will pull this metal wire.
Note the round ball at the tip, you have to pull it out a little to fit it back
How to fix it ?
Simply slot it back in.
It seems like this is a common issue, sometimes they vibrate out over time, came off while transporting, or from a bad factory assembly.