Hello all, hello Flo, I didn't want to wait any longer for an answer, so i ordered the RC element from Eltako that is suggested before. I installed it near the relais. I put the neutral on the same neutral from the heatpump. And i used one output of the element parallel on the signal to 143.5 and another parallel to the signal to 143.4. I can confirm it works great now, i measured 0 volts now, thanks to Marc and other suggestions in other topics. My cable is only 10 meters from the heatpump to the elektrical distributionbox and the 2 relais. I used one shielded cable, 5G 0.75mm². As Marc said before, normally this is something Viessmann must be dissolve. In Belgium nobody answer from Viessmann, they didn't understand what the problem was and thinked i wanted to used the EVU block and send me the wrong manuals with the wrong status explained an so on😏 I hope i don't have other problems in the future because this is not a good service. I measure also the full electric power to my heatpump, the inside unit and the outside unit and the elektric heating element, all together. So i know exactly how much elektricity it used. I knew the elektrical power is calculated, but it is sometimes even the half of what my Fronius Smart meter measure😊 That is not a problem for me, but i use also the thermal power that is calculated in Vicare, so i can have a idea how much money i can safe now. I hope that is trustworthy. Before i had a vitodens 222W gas heating. greetings
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