The heat will not work on lower level .Works fine on upper level Have new circulator pump, zone vales work, aquastat is set at 180 and boiler at 15 psi.Have bled system many times.still no heat downstairs. Radiators get hot when bleeding them and then get cold after about 5 to 10 minutes also when it is running (heat),one part of living room gets a little warm while other area is cold.It appears to be a circulation problem but no one knows where to blow the lines from or just don't want to mess with it.
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