A cold upstairs can indicate air in the system. Try bleeding it carefully if you have one of those small square keys.
I thought that the floors donāt necessarily need to be warm/hot for the system to be functioning properly? Our floors have a few spots that are a bit āwarmerā than other areas, but there certainly are not any truly hot or cold areas and the flat temperature overall is perfectly comfortable. If someoneās floors are so warm they hurt the feet, something sounds off to me. Maybe a broken thermostat telling the system itās crazy cold and to heat to the max?
I assume you are talking about the air temperatures in the rooms and not the actual floor temperatures?
If the bedrooms are upstairs then 21āC certainly isnāt too cold and anything from around 15.5āC to 19.5āC is considered an ideal bedroom temperature.
For me at least, 25āC would be way, way too hot for a living room but then Iām from the UK !
Underfloor heating is the best thing since sliced bread and vastly superior to radiators or warm air for efficiency and cost.
Our heat pump currently outputs at 38Ā° and returns at 30Ā°. This heats the house to 23Ā°. The tiled floors have a couple of warmer areas, but are generally what I would describe as ānot coldā. I can compare the tiled and unheated stairs.
I set up the various valves and thermostatic valve 18 years ago when we moved in making the bedrooms cooler and bathroom and living areas warmer. I have not had to alter anything sinceā¦
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Our Heat Pump has a user controlled output temperature from 22-26Ā°C. If the system runs too hot it shuts down for a cooling period. That only happens when set to 25.5 or 26Ā° Running at 25Ā° gives us better heating as it doesnāt shut down.
Due to the current ice age itās set to 25Ā° Will will turn it down when normal temperatures return.
Where exactly is the bleed valve for floor heating? 
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On the manifold - it is identical to a normal wall heater.
Not on ours.
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We have bleed valves on both a new (2025) and old (1989) manifoldā¦ are you sure you donāt see any in the corners?
And yes 25C in the bedroom is way too much, for us having 22C around the house would be perfect. And now I think something is odd with the downstairs manifold valves, Iāve shut them all offā¦ and the heat overnight still rises in most floors (Iām measuring air temp with a bunch of Sonoff thermometers).
I think its more than just air, I think theres way too much water moving in the pipes downstairs and the water upstairs is just a degree or two too cold.
Reducing the flow downstairs is likely to increase the flow, and temperatures upstairs.
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TLDR; maybe floor heating is ok or even better, but the overall design of modern building is not
Well, living in any āstandardā apartment I hardly ever cranked the radiators (perhaps only for periods when I had a cold), but here I have windows top to bottom ~1/2 of the total āwallā surface, and itās like that on both sides of the apartment, roof above, and forced ventilation, so I have my floor definitely warm which for me is unusually hot for bare feet walking (and I like bare feet walking) whilst I wear jumper through de day as itās a bit chilly already at half the height of the apartment because of the forced air ventilation. Overall livable, but for this climate zone with winters If I were to build a house for myself Iād not make windows so big and Iād install heat recovery unit in the ventilation, not just pure open holes for the air to flow from outside to the central sucking pump through an inlet in the bathroom.
There are systems around that are self bleeding.