Tunze 6105 pulsing quickly!! Not running

[GHL Support]

I have however found another issue with my dosing pump. I have the older GHL 4 unit dosing pump and for some reason pump 1 is not controlled. It works from the unit red button but it does not from the GHL control when clicking on it and all the others 2,3 & 4 do. Therefore its not dosing anything I've programmed for it.

Are you able to switch pump 1 on/off via the PC-Software (under Socket functions - on/off-Button)?