Troubleshooting Grundfos 40-105 180 Air Pump Venting Issues in 200m2 Floor Heating System

Hello
I have 200m2 of floors
in the installation I had a Grundfos 25-60 180 pump I exchanged for a Grundfos 40-105 180 (I bought a used one)
and a problem arose because he couldn't vent her.
With the old there was no problem and it was vented without a problem ....
What may be the problem ?? the pressure in the installation is 2 bar.

Can there be a pump? not working ?? because used?

Such a strange symptom - when it turns all the circuits is like unscrewing the pump, no water flies (it can be unscrewed half a day and nothing will fly)

As I attach a few circuits, it shows water ...

I don't know what I'm doing wrong and I don't know where to look for the reason ..

Or maybe the pump is too strong?

What I also noticed how to turn off the heating (stove) and the screw on the pump is turned off, you can hear the air escaping ...

please help

Devil wrote:

What I also noticed how to turn off the heating (stove) and the screw on the pump is turned off, you can hear the air escaping ...

And you have to wait until the water shows up.