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Pressure is fine. It is just in the middle, and it is like that for the last few years, so i don't think anything is wrong with it. Water in the bottom UFH manifold is cold as it is on top, because it just doesnt have time to heat up. As i explained before, as soon as I turn on the heating...

Hi guys, sorry for the delay, I was out of town. I was hoping the issue will resolve itself, but I'm out of luck. Same issue still persists. Here is picture more to the left: When I turn on the heating nothing much happens. It seems flowrate through each of the 8 loops does not really starts...

Hi Johntheo5, here is the picture. When you say "flow meters" you mean that label "118m" on the third pipe from the left? It is hard to reach on most of the pipes, but i will try it that is required information. Also, i have checked d.40 and d.41, and they are both °C.

No, I don't have separate pump. Only pump in boiler...

Thanks you, It seems it might work. I will try tomorrow...

Hi Johntheo5, Not sure where i can collect this information, but i will try, and provide you results. Thanks

Thanx for the explanation. Is there anything else I can do to troubleshoot, or this is a job for an engineer?

Hi CBW, Thank you for the reply. After i turn on floor heating, boiler starts working, and if I press top two buttons, i see S.00 what should indicate that everything is ok and heating is working. After minute or two, hourglass appears, and i see S.07. If I wait for a minute longer, S.08...

I have a problem with the Vaillant ecoTEC pro VUW 246/5-3 gas boiler. The boiler is paired with an Vaillant eRELAX/vSMART thermostat/application, and I have floor heating. Until recently, everything worked as it should, but now the floor heating no longer works. Hot tap water still works...