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Old 04-14-2011, 10:49 AM   #1
Join Date: Apr 2011
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furnace problem

Hi folks,
I have an oil furnace with 3 zones using forced hot water to heat my house.I have noticed when the furnace runs to maintain the domestic water temp,hot water is forced up through the 1st floor baseboard even when the heat is not called for in the house.What would cause the hot water to be forced up through the baseboard? I have noticed a drop in my pressure due to a leaky coil gasket but it usually holds approx 10-12 psi.I also have a lot of bubbling sounds on the 2nd and 3rd floor zones when the heat comes on.Air in the lines I assume, but would any of these cause the problem?There is also an expansion tank just before the 3 zones split off to each floor.Could this be faulty and causing my problem? The furnace is 20 years old also.
Any help is greatly appreciated,


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