I live in an old building in Boston, have radiator heat and just turning on for first time. Valve is a Danfoss RA 2000, but I don’t know how I know what setting is on. There’s a red line between 4 and 5 on the valve - is that a warning or does that mean the heat is on? Also, nothing happens when I turn it on, even past 5. Any help would Be great, thanks
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