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

So, there was a fault 760 defrost again last night. The whole house is also getting cooler, about 1 degree lost.

Today I switched the efficiency pump from automatic to manual. Now it runs at 1500 l/h instead of 800 l/h. This also doubles the flow rate in the bathroom.

I'm curious to see what happens. Maybe the whole system will completely fall apart now.

I read in another forum about voltage numbers of the pump: 10 volts nominal and 3 volts eff. I don't see any of that with me, no settings possible.

It would be great if one of you could look into the menu to see what options are available under efficiency pump settings or if you find this voltage setting anywhere?

which settings can you choose on the pump? Shouldn't it directly "modulate along" with the heat pump?

which settings can you choose on the pump? Shouldn't it directly "modulate along" with the heat pump?

I can choose automatic, then it modulates along. But in my opinion that doesn't work for me, because the flow rates are too low. That's why it's now set to manual with 100% max and 40% min.

have you reduced many circles? What software version does your machine have?

have you reduced many circuits? What software version does your machine have?

All circuits are open. The software version is the latest, installed two weeks ago, I am uploading a csv here.

01/12/2021	10:12
System status:
Heat pump type	LWA 12
Heat pump type	HDT_9
Software version	V3.85.6 (r6445)
Bivalence level	1
Operating state	Heating
Actual power	6.69 kW
Defrost requirement	6.9%
Last defrost	##########
System settings:
Utility lockout	without ZWE
Room station	No
Integration	Return
Mixing circuit 1	No
Fault	without ZWE
Hot water 1	Sensor
Hot water 3	without ZUP
Hot water 4	Setpoint
Hot water 5	with HUP
Hot water + heat pump max	0.0 h
Pump optimization	Yes
Access	Customer
Monitoring VD	On
Control heating circuit	Outdoor temp. dependent
Control mixing circuit 1	Outdoor temp. dependent
Boost heating	with mixing
Electric anode	No
Heating limit	Yes
Remote maintenance	Yes
Pump optimization time	10 min
Message TDI	Yes
Release ZWE	60 min
Hot water reheating	No
Hot water reheating max	5.0 h
Smart Grid	No
Control mixing circuit 1	fast
VD heating	Yes
Temperatures:
Return limit	45.0°C
Hysteresis HR	1.5 K
Hysteresis HW	5.0 K
TR max increase	7.0 K
Release ZWE	-2.0°C
TDI set temp	60.0°C
Outdoor temp max	40.0°C
Outdoor temp min	-20.0°C
Lowering until	-20.0°C
Hysteresis KR	2.0 K
Max. hot water temperature	60.0°C
Min. return set temperature	15.0°C
Pump efficiency:
Heat distribution system	Underfloor heating
Control heating	Manual
Heating nominal power	100%
Heating minimum power	60%
Control hot water	Automatic
dT cooling	5.0 K
Additional heat source 1
Type	Heating element
Function	Heating and hot water
Position	Integrated
Output	Out 1
Pump lead flow:
Pump lead flow ZUP	60 s
Priorities:
Hot water	1
Heating	2
Swimming pool	3
System configuration:
Heating	Yes
Hot water	Yes
FlexConfig:
OUT 2	ZIP
OUT 3	FP1
Heating curves heating	27.5°C
Operating hours information:
Operating hours VD1	5689h
Impulses compressor 1	6327
Average runtime VD1	00:53
Operating hours ZWE1	100h
Operating hours heat pump	5689h
Operating hours heating	4867h
Operating hours hot water	816h
Temperature information:
Flow	28.1°C
Return	25.3°C
Return set	26.6°C
Hot gas	62.3°C
Outdoor temperature	-3.1°C
Average temperature	-4.7°C
Actual hot water	48.0°C
Set hot water	48.0°C
Heat source inlet	-2.6°C
Flow max.	60.0°C
Compressor suction	-3.1°C
VD heating	51.3°C
Superheat	7.5 K
Superheat set	7.1 K
TFL1	19.0°C
TFL2	24.5°C

Do I understand this correctly:
Lstg. Hz. Min. 60%

Does that mean the minimum performance of the heating is 60%?
If yes, reduce it to 20% or so