[Solved] Incorrect voltage at roller shutter controllers after installation of ROP-01

Hello All,
Yesterday I connected two ROP-01 modules at my place, the first one mounted in the box under the switch. The second one, on the other hand, in the switchboard. I control two modules with a wireless switch from Karlik - 27DEF-2. The control works flawlessly. However, after some time the roller shutters control stopped working (F&F controllers mounted in the switchboard). I checked with a meter the contacts 1 and 3 of the roller shutter controllers (where the power should come from) and there is about 150-160V. On the other hand, when I measure the voltage between the phase terminal on the controller and the neutral terminal in the switchboard the meter indicates about 400V? I have switched off the fuse that protects the roller shutter circuit for the moment. I already abandoned the subject yesterday. Could the connection of the ROP-01 modules have had an influence?
Thank you in advance and best regards,
Michael.

I would be looking in the electrical system. Suspicious zero connection. If you've moved anything in the installation start checking with that.

In that case, I will start with that and let you know what happens next.

Hello again.
There was indeed a problem with the zeroing. I have corrected the connections, tightened the terminals properly and everything is running smoothly.
Best regards,
Michael.