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

Do you use the guest room regularly because you have 2 there?

For me, that's the room where I still have an ERR in operation. The door is mostly closed and the ERR is set low. Only when guests come or our child wants to set up their racetrack for a longer time is it turned up sometimes.

I dry laundry there, so it shouldn't be too cold. I always check the humidity and temperature with a hygrometer. Otherwise, it’s used little, I think 1.5 is probably enough there.

The room temperatures would still be good Can still reduce parents to 0.75. Measures the return temperature during heating tomorrow. Then adjust the return flow dressing room accordingly. The two heating circuits should have roughly the same return temperature. Please measure the supply and return of the small bathroom, then look at the current supply and return temperature in the heat pump control and adjust both here. The return temperature in the living area should also be approximately the same. If you have bought the recommended thermometer, you can place it directly, measure 3 times for self-check. Presumably, the base point with 21 is too low, we'll see. Show the heating engineer the unreadable flow tube, he should actually replace it...

The room temperatures would still be good You can still reduce parents to 0.75. Measure the return temperature tomorrow during heating. Then adjust the return flow wardrobe, you adjust it. The two heating circuits should have approximately the same return temperature. Please measure the flow and return of the small bathroom, then look at the control of the heat pump for current flow and return temperature and set both here. The return temperature living area should also be approximately the same. If you have bought the recommended thermometer, you can place it directly, measure 3 times for self-check. Presumably, the footpoint with 21 is too low, let's see. Show the heating engineer the unreadable flow tube, he should actually replace it...

All right, I will definitely do that tomorrow. I have bought the thermometer you recommended. (basetech Mini 1). Yes, he should definitely replace the tube. It's not acceptable that nothing can be read there. He should also check why the float of the main bathroom always docks at the very top, as if there were 0.0 volume present.

Good morning, here is the data from this morning. Nothing has changed again :-( total heat in the bedroom and corridors, but bathroom still only 20.8.
I have now set the ERR to 2.5 while sleeping, I can't leave it that hot, our baby wakes up every 2 hours (usually sleeps through).
Temperatures measured at 5:30, the controlled residential ventilation is running at reduced strength (22-7h). I have adjusted the heating curve to 29-21-0 and set -0.5 in the settings at the front.
The pump has been off for 4 hours, so no data on flow and return temperature yet.

The technician is coming this afternoon. He should boost bathroom and living room!

I would significantly reduce sleeping instead of adding the ERR. For example, 0.25. If necessary, approach your desired temperature from below.

Hallway and bedroom each down by 0.4, small bathroom to 2. I am now on the way to Denmark, will get back to you in the evening. Please still provide the temperature supply and return for the small bathroom