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Cast iron boiler pipes not heating

I have a cast iron oil fired boiler for heating my home. the furnace works fine. there his oil and flame and the blower works. however there is little or heat coming out of the vents. i checked the pipes. i noticed that the pipes that go upstairs are are warm, but the pipes that that go to the downstairs are cold and there is no heat coming from the vents downstairs. i also used to hear a sort of gurgling sound as of water was running into the pipes, but i do not hear that anymore. any advise? Thanks.

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IT sounds like the pump if this a wet sytem the expaisin tank could be dry

Posted on Feb 02, 2010

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Thanks for your question at FixYa.com. I hope I have been of assistance to you today.

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