Climate Solutions Community

micron01 · ‎02.11.2025

So in short: there was a maintenance for my installation and after the cleaning of every filter, the technician did run a aktortest to see everything is running great. Before the test, the setpoint of the pump for heating tapwater was set to 50%. I've seen that the technician did the test of the pump at 100% speed to see if its running without trouble. @Flo_Schneider Is it possible that the technician must first set back to 50% before he closed the aktortest? For my normal heating it is no problem, because i need that higher flow of minimum 1400l/h, but i don't want it for heating tapwater because that is unefficient. I have the software version 2509 from juli, and still have that version now. The maintenance was at 16 oktober in the evening, you see the difference (max watts needed) and the dates on the twoo pictures., one before the maintenance and one after, now it is everyday as the second picture. As i said before, i tried to change the speed myself in the servicemenu, the numbers change but not the real flow of the pump.

micron01 · ‎01.11.2025

Hi, i have now something comparable with my heating pump as your problem. I have a vitocal 151A, with only floorheating but without a extra buffer. In the past i had software 2323, my flow was to low, around 800l/hour, i complained a lot at my heating installer because of that, i had to much runs in the past, mainly with cooling in the summer but also with normal heating, but not with tapwater heating. After twoo summers complaining and asking alot of times for raising the flow and getting maybe a new softwareversion, i did get finally a software update this summer, i have now version 2509. After that i had a good flow for my installation, 1400l/hour for heating and cooling and around 1000 l/hour for the tapwater. It has always been around 1000 l/hour for tapwater, also before with version 2323. As you can see in the first picture, when the tapwater was heating it was everyday frugal and never higher than 2000 watts maximum for getting 55 degrees tapwater temperature, with economic mode always on. But at 16 october they did a maintenance, they cleaned the 3 filters, one for the ODU, the magnetite filter and another one, they were not very dirty, also because i cleaned it myself sometimes. After the cleaning the guy run the actortests and from that moment there is something wrong. From that day, when my tapwater is heating, the pump have everytime the maximum flow of 1490 l/hour, it is to much and the temperature is raising to fast and ofcourse also the power that is needed. Now it is everyday 2800 watts maximum for getting a temperature of 55 degrees. See the second picture. Now it is the first time that i use the servicemenu myself, i tried to set the speed of the pump lower with 1101.1 and 1101,2 but it changed nothing, the maximum flows for heating the tapwater stays at maximum, around 1450 l/hour, the pump is now set to 50% as in the past, but without changing the flow for real. I only can think that it has to be something with the actortest, because the guy run it at maximum i think. The guy didn't have a lot of experience, maybe he was forget to reset something, i don't know. I'm from Belgium, sorry for the translate in (bad) english.

micron01 · ‎06.12.2023

Hi, I have a vitocal 151-A, also with the vitotrol 300-E Maybe the follow settings are done already, but it is important that the heatpump is not only working with full weather settings, but also with roomcompensation. If parameter 933.6 is set on "7" then you have roomcompensation. If that is correct, then must parameter 933.7 also have a value, in my situation it is set to "16". I did have a lot of starts/stops in the beginning and the room was mostly to hot, also still after i changed the heatcurve al lot. So i asked my installer to look and change those parameters, and VM has changed it and now it is much better. I have roomcompensation now. The higher the value of 933.7 the higher the roomcompensation. greetings

micron01 · ‎31.10.2023

Hi Andi_WP, I did have the same problem before, see: https://www.viessmann-community.com/t5/Waermepumpe-Hybridsysteme/Smart-grid-vitocal-151-A-not-working/m-p/369179#M86193 The only thing that worked for me was to place an RC element from Eltako parallel with the signal, you can use this element for maximum 3 different signals if you want. The problem is induction on the signal cable. The eltako element is RC 12-230V, but it is normaly for placing in the elektrical distributionbox greetings

micron01 · ‎13.10.2023

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

micron01 · ‎28.09.2023

@Flo Schneider or other technicians from Viessmann. Can you confirm Viessmann is working on a solution for this? I invested a lot for this installation (Fronius Gen 24 plus, BYD battery and the new Vitocal heatpump) and waited 1 full year to have finally my heatpump. I have still a lot of power surplus the next months for using the Smart Grid. That is also why i've choosen the Gen24, it is very easy to work with the digital outputs and the Finder relais. But now i can't use it because the electronics of the smart grid contacts are so sensitive. And i don't want to work with 3 different cables for just switching two contacts. It would be great that someone from Viessmann take there responsibility and confirm that there is a problem. I think the next months there are a lot of people starting a new tread because of this (cable) problem. For the rest i like the heatpump very much, it is very quiet, and i measure also the elektricity consuming and i like it, it is very efficient. Greetings to you all

micron01 · ‎27.09.2023

Hi all, @Marc i can confirm that what you tried before is not working (the 5 steps) because i did the same with the same results. I also tried to ground all the not necesarry wires and the shield ( yellow heat shrink tubing) from the signal cable. (see photo) My relais are for sure good, if the contact is open there is 0 voltage on the contact. greetings

micron01 · ‎27.09.2023

Hi Marc, Thank you for your answer, i'll check also the other topic and your link to the RC element. The heatpump is just one week installed and i want to be careful with everything, for the warranty. I'm in contact with my installer and i hope he has giving feedback to Viessmann already. I don't understand why they don't using the 24 volts for the contacts of the SG contacts. The voltage is already in the heatpump above. I ask myself if there is already somenone that can use the SG as it meant to be working. I know it works in older heatpumps. But the 150 and 250 serie i don't know yet. greetings

micron01 · ‎27.09.2023

@Flo_Schneider ? I also want to add that when i release the wire from contact 143.4 or 143.5 on the heatpump, then the status return back to normal immediately (status 2) best regards

micron01 · ‎26.09.2023

I have talked with my installer and send him some photo's Also did i test the same situation but with two cables, one for the 230v 143.1 and another for the signal from the inverter. I put one cable on the ground (230v 143.1) and the other is shielded with the contact signal(143.4 and 143.5). The problem is better but still resist, because when status 3 is active, the wire for status 4 get also the induction voltage in the same cable. I measure two times 7 volt on 143.4 with two different status (3 and 4) from the heatpump. (see photo's)

micron01 · ‎25.09.2023

Hi, I hope i can ask my question to you in english (i'm from Belgium) Did you have already found an solution for the problem with the wire and that the heatpump don't return to status 2 as long as the wire 143.5 is conected? I have the same problem (vitocal 151-A) and already started my own topic: https://www.viessmann-community.com/t5/Waermepumpe-Hybridsysteme/Smart-grid-vitocal-151-A-not-working/td-p/364429 thanks and regards

micron01 · ‎25.09.2023

Hi community and Flo, I'm from Belgium and try to explain my problem in english. I have since this week a vitocal 151-A heatpump and i already have a Fronius gen 24 for six months. Before i had the heatpump i did already set everything up for working with the smart grid in the future. I'm elektrician myself and made a installation with two finder relais and cabling everything with the fronius inverter. I did follow the suggestions of Fronius. When i set everything in the menu of the inverter, everything is working good, such as closing the relais when i have enough power from the inverter. I know also the schematic from the heatpump, i did read a lot before and search everywhere and did get also a lot of information here. My cabling is as follow: when i have the first surplus of power, the contact 143.1 close with 143.5 (contactA), when i have another surplus of energy extra, then contact 143.1 close also with 143.4 (contactB) I know also the 4 different status, 1 is the block signal of the electricy company ( we don't use that in Belgium) 2 then is the heatpump working normally 3 is a signal for recommendation for extra rising the temperature and the water 4 is a signal for forced working and heating the water to maximum settings and temperature of the heatpump. But now the problem with the heatpump: when the contact of my two relais are open, so there is no contact between 143.1 and 143.4 or 143.5 or both. The heatpump switch to stand 3 or 4. sometimes it is 10 seconds or a minut or so, but the heatpump don't go back to 2 the normal working status. Also when i loose the wire of both contact 143.4 and 143.5 on the site where the two relais are, the problem still resist. so it is certainly not a problems of the relais. maybe it has to be with the cables from the heatpump to the relais. I already use 3 different cables: a 5G0.75mm² , then the same cable but with a shield around (Liycy) and also a 5G2,5mm² that i put on the floor far away from other power cables. Has it something to do with induction, i don't know. I hope someone can help me thanks and regards

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