Error Code 8: The seal cylinder switch is on when it should be off

First check the position of the reed switch at towards the end of the fork cylinder. The light should come on 2mm before the end of the cylinder stroke. In order to check this though the light does need to come on therefore check the wiring at the circuit board plug. If the reed switch is working and in the correct position then check the free movement of the fork mechanism, the air supply and the relevant pneumatic valve.