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Some radiators boiling hot - others stone cold

Discussion in 'Plumbing and Central Heating' started by Helg, 15 May 2019.

  1. Helg


    16 Dec 2008
    Thanks Received:
    United Kingdom
    This is maybe related to another problem I posted about a few days ago, but a new problem has now come up
    As mentioned, by mistake shut down water supply into house, was off a few hours and realised only when all taps went dry.
    Got system running again, switched on taps starting from highest one and worked way down.
    The original problem was that this could have shifted something in the hot water cylinder that covered up a small hole in the coil. So now have overflow in f&e tank (have traditional system, boiler, cold water tank and f&e tank).
    But just now we realise that even with thermostat low (14 degrees, heating should be off) some rads are very hot, others stone cold (as they should be).
    Any suggestion? Also have loud gurgling where water goes into cold water tank, not long, but first thing in morning 2-3 mins, then maybe once or twice during day.
    Could some air bubble lurk in the system since the water was shut off? Maybe this screwd up the heating pipes/circuit, maybe even created the overflow?
    Until the water shut off happened there was NO overflow.
    Sorry to go on and on, but as I made the original mistake i am under pressure from my other half!! Help!
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  3. Madrab


    4 Oct 2012
    Thanks Received:
    East Renfrewshire
    United Kingdom
    Yes, it sounds like you may have a pinholed coil in the cylinder, as the main CW cistern is above the F&E cistern that then overflows first.

    Why some rads are hot and some cold even when the thermostat isn't calling for heat could be a zone valve problem, is the hot water calling for heat? Do you know what heating setup you have? S Plan/Y Plan/Gravity etc

    I think you need to get a professional familiar with these systems in to fault find and repair for you.
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