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I have no heat in part of my house, but I do have heat in the other parts of the house.

My boiler is hot But I have no heat on the lowest level of my home.

First a brief overview of the different things that may cause this problem.

1 The zone valve to that zone is bad. 2 The thermostat to that zone is bad. 3 The circulator, pump for the whole house is bad. 4 The Circulator pump for just that zone is bad. 5 The relay or control to the circulator pump is bad. 6 There is a bad or broken wire. 7 A pipe is broken under the slab.
8 The zone Is air bound. (rare for a lower level, but Possible) 9 The zone is frozen. There may be other reasons that don't come to mind at this time.

I have no heat on the upper level of my home or other zone.

First a brief overview of the different things that may cause this problem.

1 The zone valve to that zone is bad. 2 The thermostat to that zone is bad. 3 There is no Pressure in the boiler. 4 The Circulator pump for just that zone is bad. 5 The relay or control to the circulator pump is bad. 6 There is a bad or broken wire. 7 The zone Is air bound. 8 The zone is frozen. There may be other reasons that don't come to mind at this time

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