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Towel rail not heating up properly at top?

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Hi,

We hope someone might be able to help us: we have a heated towel rail, the sort that is plumbed into the central heating system like a radiator would be.

Ever since it was put in it never heated up on the top "rungs" (it is ladder style). Recently fewer and fewer of the top rungs are heating at all, with the lower rungs being piping hot. Please does anyone know what the problem and solution might be?

It is a combi boiler which was fitted about 1.5 -2 years ago with no other problems with the boiler or other readiators that we are aware of.

Ta muchly.
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  • WestonDave
    WestonDave Posts: 5,154 Forumite
    Rampant Recycler
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    Probably got air in it - bleed it by using a bleed key and opening the vent until air stops hissing out and water starts coming out.

    Whether its right or not, I tend to assume that because the top of our towel rail is the highest point in our heating system, that is where the air collects - it certainly seems to be the only radiator that does it.
    Adventure before Dementia!
  • WestonDave
    WestonDave Posts: 5,154 Forumite
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    - should have said - bleed it when the system is cool and when you've done check the pressure on the boiler as it may need repressurising (you've just let something out of the system so it needs replacing with more water!)
    Adventure before Dementia!
  • 1984ReturnsForReal_2
    1984ReturnsForReal_2 Posts: 15,431 Forumite
    edited 11 January 2010 at 6:23PM
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    Go up in the loft to the F&E tank & make sure the water is at the correct level..

    Its likely that the water level is dropping in your system.

    (see below, ignore my post if you do really have a combi system)
    Not Again
  • WestonDave
    WestonDave Posts: 5,154 Forumite
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    F&E tank with a combi? I doubt it (to be fair its easy not to spot the combi reference in the OP) as they are normally closed systems.
    Adventure before Dementia!
  • 1984ReturnsForReal_2
    1984ReturnsForReal_2 Posts: 15,431 Forumite
    edited 11 January 2010 at 6:10PM
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    WestonDave wrote: »
    F&E tank with a combi? I doubt it (to be fair its easy not to spot the combi reference in the OP) as they are normally closed systems.


    Oooops.

    Pressure & air then...


    I was reading the high rad & lowering heat level.

    :eek:
    Not Again
  • wimbleQ
    wimbleQ Posts: 94 Forumite
    First Post First Anniversary Combo Breaker
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    Hello

    Many thanks for the replies. Yes, definitely no tank as far as we know(!) (if there is it's new to us....).

    Will try bleeding but just looked at it - at the top it has a sort of nut thingy on the top, one on each side. The one on the right hand side has a sort of screw slot thing in its middle - am I correct in assuming we just put a screwdriver in the slot and turn this in order to bleed? I can't see anywhere where a key should go and haven't got a key for it.

    Apols for dimness!

    Once this is figured out then we should switch the heating off, wait for it to cool down and then bleed. Then go to boiler and see if it needs to have pressure added? Have I understood this correctly pls?

    Ta muchly again
  • macman
    macman Posts: 53,098 Forumite
    Name Dropper First Post First Anniversary
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    You just buy a radiator bleed key-pence at any plumber's merchants or DIY shed. It doesn't require a screwdriver. The bled valve's just a recessed nut on one end of the top rail.
    No free lunch, and no free laptop ;)
  • keystone
    keystone Posts: 10,916 Forumite
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    WestonDave wrote: »
    Probably got air in it - bleed it by using a bleed key and opening the vent until air stops hissing out and water starts coming out.
    That's be right by my estimation.
    Whether its right or not, I tend to assume that because the top of our towel rail is the highest point in our heating system, that is where the air collects - it certainly seems to be the only radiator that does it.
    Nine times out of ten you'd be spot on.

    Cheers
    The difference between genius and stupidity is that genius has it's limits. - Einstein
  • keystone
    keystone Posts: 10,916 Forumite
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    macman wrote: »
    You just buy a radiator bleed key-pence at any plumber's merchants or DIY shed. It doesn't require a screwdriver. The bled valve's just a recessed nut on one end of the top rail.
    Most bleed valves have a slot to take a screwdriver these days. Like this:

    0879-0880A-Bleed-Valve-L.jpg

    Cheers
    The difference between genius and stupidity is that genius has it's limits. - Einstein
  • roger196
    roger196 Posts: 610 Forumite
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    Do not remove bleed screw, just undo it a couple of turns at the most. If water in rad still warm, you can feel this warm water rising as the air comes out. Have rag ready to mop up any water which does come out.
    When boiler is next serviced, ask for water to be checked for enough inhibitor. This stops mould growth inside the rad which is a possible cause of the air. Also ask for automatic bleed valve ( or air vent) in the boiler to be checked for correct working.
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