Underfloor heating air-water heat pump. House too warm when the sun shines

Can be done. But installed actuators that are normally open without power deliver the same result when unpowered as disassembled normally closed ones. Why do you want to invest money in actuators if you buy them with the intention not to use them? The [HKV] also work without actuators! My suggestion: disassemble and sell, and do a proper hydraulic/thermal balancing.

The background would be that I then have the system visually or at first glance in its original condition. If I call customer service for any other malfunction of the system with ERR deactivated and actuators lying loose in the distributor box, they will not dwell on my intervention in the system and look for the possible cause of the malfunction there.

Then you don't sell the actuators and install them temporarily during a customer service visit. They only come upon request and never unannounced

From experience, I can only say that everything works perfectly without ERR

Hi Daniel, I can't visualize it, I don't know how to do it. Since our installer was here, it's been strange - heating curve is as follows: 34 - 21 - 0 and hot water at 46.5°. In our bathroom it only gets warm to 20.5°, although the ERR is set to level 5, which is 25°. And in the guest room, which is not used, I had set about 18°, now it's warm with 21°. I don't understand this anymore. I think I'll have a Novelan technician come. But what is definitely better now - the heat pump runs longer, no longer just a few minutes. Still, I am so dissatisfied with the result - the technician didn't need to come. I'm afraid to close the ÜV, because if something happens afterward, due to the warranty. Can there be problems with that?

In our bathroom it only gets up to 20.5°, although the ERR is set to level 5, which is 25°. And in the guest room, which is not used, I had set about 18°, but now it is warm at 21°.

Hydraulic balancing necessary, or messed up, or fundamentally wrong.