The zero always rotates on the drive when the device has been operated, and as long as the drive lighting is switched on. This is the case when the drive has moved or also when settings have been made on the device.
The F stands for error, a reason can be e.g. that the drive has detected an obstacle or a blockage. The F also appears if the lower end point is set too low and the drive therefore cannot close completely.
The L always appears when the microswitch on the motor head has been actuated by the cam in the chain/toothed belt. Thus, when the gate is opened or closed, the rotating 0 appears first, then, when the cam actuates the switch, the L appears for a few seconds and then the rotating 0 appears again. Via the actuation of the switch by the cam, the position of the end position is always synchronized again.
An H appears in the display when the electronics cannot read an impulse from the motor. Some models have a separate motor fuse in the motor connection cable, if this is defective, the H appears in the display. In rare cases, the plug connection from the electronics to the motor has become loose, so that no impulses can be transmitted. In this case, the cable should be disconnected once in a de-energized state and carefully reconnected.
The A appears when a light barrier is connected and has been triggered.