yes, the old ivt always finished with hot water

thanks a lot
so u say that its o.k that evrey time that drift on its go to vv at the end of the proces
(the varmvatten 40/45/50 that i can adjust inside the pump its for the sensor to tel the pump when to start ? if its set to 45 its meen that under 45 the pump start for varmvatten ? )

I thought it was because of the vaxelventil and I already ordered a replacement cartridge vczz6000 because I also saw that I was taking out the vaxelventil motor  and there was a drop of water on the spring.
Maybe someone here can explain to me how I change the cartridge. I understand that I have to empty all the water and only then I can replace it .
  I have a few valves that I can close in order not to empty all the water in the radiators and under  floor heating
Is it the right thing to do or is there a way to change  without emptying?

i attaced some pic
 thanks again
ahlon

Lexus, how do the new ones behave?

Heat pumps with Rego 600 terminate with a hot water charge if the actual value is below the setpoint.

Heat pumps with Rego 1000 regulate similar ..... I suppose. 

yes, the old ivt always finished with hot water