Open the control dialog. It shows three things side by side:

Controller release

One tick per channel board. Every board fitted must report its release; if a tick is missing, the cause is in the error log of exactly that board. Common causes are a shorted triac for which the board shuts down as a precaution, a fault in the current measurement, a board still in update mode, or a board that is still starting up and performing its measurement calibration. So wait a moment after switching on before investigating.

Command

Your command as it arrives at the start of the safety circuit.

Feedback

What arrives at the end of the safety circuit.

If the feedback differs from the command for more than four seconds, the device withdraws the command by itself. That is not a fault but the safety function – it prevents the device from switching permanently against an open safety circuit.

If all releases and “Boards OK” are set and the feedback still fails to appear, the external release or emergency-stop circuit is open. Check whether the emergency stop and all integrated switches have released. If the connection is not used it has to be bridged; in the factory state it is (display board, X100, pin 3 to pin 4). If “Boards OK” is missing, see FAQ-07, “Boards OK missing”.