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

How does this actually comply with legionella prevention? I know (from the gas heating context) the guideline of 60 degrees in the storage tank, which is still quickly found online today. Are there other ways to prevent the proliferation of legionella?

Ensure flow-through or run the legionella program, then heat up once a week

You can do that too, but the heating engineer can't just skip the entire commissioning. You probably paid for that as well, right?

No, he still wants to do it, but he's so booked up that he never has time. It's really annoying.. I spoke to our construction company again, they said he will get in touch next week. Everything goes through our construction company, which is really very reliable, but dealing with plumbing is a nightmare.

My heat pump has been running for 5 hours:

Flow temperature: 23.7 degrees
Return temperature: 24.3 degrees
Return setpoint: 26.2 degrees
Outside temperature: -3 degrees

Hey, I have now evaluated the data, take a look and let me know what you think:

Wow,
After 4 months, almost 4000 compressor starts already. You urgently need to optimize the heat pump settings, otherwise you will buy a new heat pump in a few years!
Dismantle the ERR, open all heating circuits completely at first, close the bypass valve completely, set the hot water hysteresis to 6K, hot water target 48°C, heating curve 28/22/0. And no, your installer will not give you an optimally adjusted system.
Regards, Daniel

Thank you very much for your response. Our installer is coming on Monday, I will confront him with it!

Oh, I should perhaps also mention that our heating has already been installed and switched on since April, since the screed drying program. So it has been in use for more than 8 months.