Temporary radiador removal on Combi-system

Discussion in 'Plumbing and Central Heating' started by diymatt, 8 Apr 2007.

This topic originated from the How to page called Removing a radiator.

  1. diymatt

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    Hi,

    Can I ask for some advice?

    I have a towel radiator in my bathroom on my combi-system. I need to remove the radiator for a few days but still be able to run the rest of the system. The radiator will eventually need to be re-connected.

    I have shut off the valves and removed the radiator. Once the boiler pressure drops to zero the water leakage stops.

    As soon as I increase the pressure the pipes start leaking again. How do I get the hot water (and preferably the heating) back on without re-connecting the radiator?

    Thanks,
    Matt
     
  2. breezer

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    i should think it would help if we knew which pipes that leak.

    if its from where the towel rad was the valves are not 100% shut, if its the rad valve nuts where the towel rad was tighten them
     
  3. namsag

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    I take it you mean it is leaking from the open part of valve now it is not connected.. Either try turning valve off a wee bit harder or buy a couple of blanking caps till rad ready to go back on
     
  4. diymatt

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    It leaks from the valve on the pipe that goes into the radiator. If I shut the valve off further will that stop it leaking? Is it possible to have the radiator off and the valves shut off but still run the boiler with a sealed combi-system?

    Thanks
     
  5. namsag

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    You can try closing them more but becareful not to tighten it passed the f##k it point . This is where you think you can get a little bit more on it and the shaft shears off followed by you saying f##k it why did i do that
     
  6. diymatt

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    Thanks for your advice. I tightened the valve a bit further and it now no longer leeks.

    However, I now have a new problem! :(

    Once the radiator valves were capped off, I went back to the boiler to re-pressurise it. I used the loop to get it into the green zone and then the pressure lept to c. 3.5 bars. I have tried undoing the valve on the removed radiator and letting water out. The pressure goes down but as soon as I shut the valve again it goes back even higher than before.

    What can I do?

    Thanks
     
  7. gas4you

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    Sounds like the filling loop valve is not shutting properly.
     
  8. ijc

    ijc

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    Hi

    I'm no plumber, just a DIYer, but had the exact same problem you describe. After refilling, the pressure just kept rising...

    To resolve I just had to keep tweaking the tap on the filling loop, and then monitor the pressure for a while. You can kind of feel when it closes, but the tiniest movement just lets water in again and up goes the pressure. Very fiddly, very annoying, but worth persevering before you call a plumber.

    I also think your boiler ought to vent the excess water if the pressure gets too high, so wouldn't worry too much about that.

    Good luck!

    Ian
     
  9. saleem

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    You are right filling loop valve is culprit because i had exactly same problem.I turned the valve on full off position and opened the filling loop,water was still leaking.I turned it touch to open side and it stopped leaking.Filling loop isolater valve needs changing.
     

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