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One radiator not working: Junker gas heated hot water

The radiator is the newer style flat-panel. The water-pipe leading to it is hot, but the radiator is not; the other radiators (old style) are working.
There are two knobs at the bottom not one, see photos. One knob is truned to maximum. I see that inside the other one there is something kind of circular but open-topped, maybe it needs to be turned for the radiator to work?
What else could be the problem?


  • neilc
    neilc Member Posts: 2,709
    what about the top corners?
    any air vents, or plugged holes up there?

    you have hot to the left most white knob, and think it's wide open ?

    is there any heat across the bottom of that rad, going to the right?
    known to beat dead horses
  • Derheatmeister
    Derheatmeister Member Posts: 1,550
    You must be in Europe with a Junkers...
    Either way your rad is possibly Air locked..
    In europe we would turn off the system circ/boiler and use a little air purging wrench to get the air out of the Rads
    The wrench looks like this