Radiators Hot but no hot water

Discussion in 'Plumbing and Central Heating' started by clarence13, 8 Jun 2009.

  1. clarence13

    clarence13

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    Hi

    I've recently bought a house with an old gas central heating system. The radiators and the hot water were all working fine. I made a few changes, removed a radiator from the kitchen and moved a radiator from one wall to another in one of the bedrooms. I also power flushed the system. When I came to fill the system back up, there appeared to be an airlock in the central heating, so I took a hose connected to the rising main in the Kitchen and flushed from the central heating tank in the loft. This seemed to get things started and all the radiators came back to life. However the hot water doesn't seem to heat any more. There is a diverter valve, not sure if this is working and the pump seems to work fine.

    Could someone help me troubleshoot this one please.

    Let me know if you need more info.

    Thanks
     
  2. Gasman1015

    Gasman1015

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    You have an airlock in the hot water circuit.
     
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  4. clarence13

    clarence13

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    Thanks Gasman1015,

    Do you know how I can clear this one? I can't seem to find an 'easy' end of the system to try and flush.

    Where the top of the coil comes out of the tank, there's a T connector with the top end going nowhere and the pipe going down to the floor. As far as I can tell, this seems to be the highest point in the hot water circuit/coil section.

    Would it make sense to switch the hot water pump on and then while it's circulating, loosen this nut to let the air out?
     
  5. raychmike

    raychmike

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    That is indeed your bleed screw/nut mate loosen it let the air out and your heating coil should fill and give you HW back. Id leave the pump off while you do it mate. Long as you get that coil filled and circulating again any traces of air should find there way to radiators. Just re-bleed everywhere in a week, starting lowest point first.
     
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  7. clarence13

    clarence13

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    Thanks raychmike and Gasman1015.

    My airing cupboard had some chipboard covering the top of the nut. Cut it out of the way and could see the radiator bleed valve thing there. Looks like it's starting to warm up now. Thanks for all your help.
     
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