Problems after changing the drainage valve

Hello, my Caffeo Solo - Perfect Milk is causing problems after a long time...

After the coffee no longer ended up in the cup but in the grounds container, I replaced the drainage valve. I had read that this is what you should do.
The part was quite dirty, and this container, which is still attached to the drive unit, was full of coffee grounds. So I also cleaned it.
After reassembly, there was a brief hissing noise, then the LED for the hot water valve lit up.
There seemed to be air in the system. So I turned it on... after a short time the water came out.
But since then the LED has not gone out. When I turn it on, the water comes out, but cold. I don't know if it should be warm then...
The drive unit reacts when I switch it on, but nothing heats up... I don't know if the heating only starts when the problem is solved.

Would be very grateful for some tips...

Jan

Did you take the hoses off the flowmeter? They are fitted incorrectly. The inlet from the tank must go in at the bottom, the outlet to the pump at the top. Change this and bleed the air again.
The machine only heats up when the machine is vented.