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Radiator thermostatic valves - need replacing?

  • 24-11-2019 1:57pm
    #1
    Dinarius
    Registered Users, Registered Users 2 Posts: 3,420 ✭✭✭


    We have 14 year old thermostatic valves on our radiators.

    The make/model is Terrier ll.

    The problem is that the radiators seem to run at max regardless of the setting - a choice of 1-5 on the valve.

    Do they wear out after a while?

    I have removed each of them and the pop-up pin (not sure what it’s called!) is working fine on all radiator pipes except one.

    Also, I can feel that the adjustment pin in each of the valves rises and falls as I turn the knob between 1 and 5.

    Should I replace them?

    If I set the valve to say, 2, I would expect the radiator to be just a little warm. How does the valve keep it like this?

    One last question...

    Our boiler is a 15 year old Heatline. When it is heating up, it goes into the red zone and then falls back to between 1 and 2. Is this a normal heating pattern?

    Thanks.

    D.


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