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g.m sir. I have yes...I also tried to purge that loop of air and when running the water thru got 4 ltr/m flow too...? I have the mixer at 45/50 degrees... I have had the cold room running all day with the actuator removed..still nothing.

Good morning all. I have a wet UFH system that seems to have stumped 4 plumbers etc.2 of the rooms just don't heat up at all. The other 2 zones do. Have a new pump , the last engineer said wasn't air locked..can adjust flow from 0 to 4 ltr/m but nothing seems to work. Any thoughts / suggestions...