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air vent on my boiler

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Ron Schroeder
Ron Schroeder Member Posts: 998
in THE MAIN WALL
As far as no heat DO YOU HAVE PRESSURE ON THE BOILER GAUGE??

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  • john_112
    john_112 Member Posts: 12
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    air vent

    the air vent on the boiler suppose to let the air out but with my boiler.. there is water coming out as well. lots of water. and my heater is not working.. i dont know what is wrong.. i had the pump. aquastic. and expansion tank just change. please help
  • Ron Schroeder
    Ron Schroeder Member Posts: 998
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    Is the boiler running??

    And is the feed valve keeping preessure @ 12psi +/-
  • john_112
    john_112 Member Posts: 12
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    the boiler is running i am not sure about the feed valve i think it is not
  • Ron Schroeder
    Ron Schroeder Member Posts: 998
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    Is there

    Pressure on the boiler gauge you probably neew to feed watyer to th boiler n1/2 inch copper going to a pressure reducing valve
  • Ron Schroeder
    Ron Schroeder Member Posts: 998
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    Just saw the pic can you tighten the cap on the venb?

  • john_112
    john_112 Member Posts: 12
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    yes i can tight it if i tighting it the air will be trap would it cause problems
  • john_112
    john_112 Member Posts: 12
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    why is there no heat in the first and third floor.
  • scrook_2
    scrook_2 Member Posts: 610
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    air vent leak

    If the boiler pressure is staying around 12-20 psi on the pressure/temperature gauge then the feed valve is letting in fresh water to replace the leakage (it will have a pressure reducing valve connected to your cold water supply and to the boiler and maybe w/ a back flow preventer (a TEE like thing w/ a small drain tube off the bottom) in series too.

    You can see if the valve to the pressure reducer/feed valve is open, if it is it should feed water in.

    The air vent should be easy to have replaced, and it is remotely possible (with a little light hand brushing and some loosening-tightening that the little cap on it can still be tightened down to close/seal the vent for now.

    The boiler water may have had a lot of air come out of solution (due to fresh water being added) following the aquastat & expansion tank change followed by the vent sticking open due to a piece of grit or the like, also there may be a air pocket in the radiation somewhere that's blocking water circulationto the first and the third floor causing you to not get heat.

    It should be easy to fix -- give a call to the installer who did the x-tank and aquastat, he shoulld be able to get you back up in short order.
  • john_112
    john_112 Member Posts: 12
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    shut of the water what do you mean exactly??


    there is no pressure on the boiler gauge.
  • Ron Schroeder
    Ron Schroeder Member Posts: 998
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    Probably air bound

    either boiler aquastat set too high and making steam or you lost water pressure
  • scrook_2
    scrook_2 Member Posts: 610
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    No boiler pressure... SHUT OFF POWER, NOW!

    If no pressure, SHUT OFF the boiler. DO NOT add water. You have air in the system, hence no heat.
  • Ron Schroeder
    Ron Schroeder Member Posts: 998
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    John Do

    As Scrook says shut down and call your heat guy now
  • scrook_2
    scrook_2 Member Posts: 610
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    No boiler pressure... SHUT OFF POWER, NOW!

    If no pressure, SHUT OFF the boiler. DO NOT add water. You have air in the system, hence no heat. Once power is off, call your service guy.
  • john_112
    john_112 Member Posts: 12
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    should the air vent be open a little bit to let air out?

  • john_112
    john_112 Member Posts: 12
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    what would happen if i shut off power ??


    how can i stop the water coming in??
  • Ron Schroeder
    Ron Schroeder Member Posts: 998
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    Not until you find out why you have no pressure

  • john_112
    john_112 Member Posts: 12
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    there is pressure pressure is at 6psi
  • adayton_2
    adayton_2 Member Posts: 130
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    leaky air vent

    looks a little rusty, perhaps I am misunderstanding something here, but, why not put a NEW air vent to stop it from hissing water.....THEN go find if there is any further leaks elswhere. 6 PSI while low is not a problem for the boiler to be running on. Also are there air vents/eliminators on other floors that are also perhaps NOT working?? i.e., perhaps there IS air upstairs. Try to "gently and carefully" bleed some radiators on each floor.

    Alfred
  • scrook_2
    scrook_2 Member Posts: 610
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    power off, etc.

    If you shut off power it will NOT fire. Then you can shut off the cold water feed and eventually the leak will slow down. It sounds as though it has trapped are at a couple places in the system, (and perhaps even in the boiler -- in which case you DO NOT want to fire it!) You might succeed in getting the cap on the vent tightened slowing/stopping the leak too.

    The air vent can be replaced, (and the other controls, etc checked) then water can be added and trapped air purged out, and you'll be back in business. It's just tough to diagnose over the net, and no doubt frustrating to you, as the house cools.

    How long ago was the pump/tank/aquastat replaced?
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