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

Do I understand this correctly: Lstg. Hz. Min. 60% Does that mean the minimum output of the heating is 60%? If yes, reduce it to 20% or so

With a modulating pump, it actually has to be set to auto. The running times are unfortunately also relatively poor. Do you have any data on hand?

I can't retrieve it, he wants to load some exe...

upload it on a proper site.

Did I read correctly that the heating element is still active?

Did I read correctly that the heating element is still active?

The last technician insisted on not turning it off completely. He said that could destroy the system. The heating element ran for 3 hours this winter, the 97 hours before that are from the initial commissioning.

The last technician insisted on not shutting it down completely. He said that could destroy the system. The heating element ran for 3 hours this winter, the 97 hours before that are from the commissioning

Ah okay. Well, I don’t think much of that, but the 3 hours obviously don’t explain anything. What source did you have again? Air?

In post #686 your spread is just 2.8K. Can you set that somewhere? Return flow of 26.6°C at AT=-3°C also seems very low to me.