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your system if it's steam has leaks and is not holding the pressure check the valve where you turn the radiator on the packing nut might need to be tighten. the air valves may need to be replaced , they should only let air escape and then shut off .they should not constantly make a hissing sound .most people think that noise is the heat comming up ,but in fact it is the steam escaping ,causing the furnace to lose pressure forging the furnace to come on to satisfy the differential pressure valve

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15y ago

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