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Old 01-01-2009, 06:31 AM   #1
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No Heat Downstairs


I have a forced hot water system. The heat will not turn on downstairs but works up stairs. The boiler is obviously working and both pipes for the upstairs and downstairs heat are hot. I checked the digital thermostat downstairs and that seems to be working fine.

Can anyone help?

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Old 01-01-2009, 06:56 AM   #2
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No Heat Downstairs


You could have one of more of the following problems:

Pipe(s) froze
Blockage in pipes
Valve set to wrong position
Circulator pump not working, due to ...
bad relay or controls
bad pump motor
bad impeller in pump

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Old 01-01-2009, 10:49 AM   #3
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No Heat Downstairs


if you have single circ pump then thats OK because the other zone is heating .so go to the zone valve for the problem zone and put it to manual by pushing the bar over if you feel resistance as your pushing the stat isn't calling or the wires going up to it are in question.if it goes over with no resistace the stat is call but you might have air trapped up downstairs.if you zons are controlled by one circ per zone check the circulator pump if too hot to touch on the body it might be cooked.
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Old 01-02-2009, 01:27 AM   #4
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No Heat Downstairs


Might have air in second floor piping.
Boiler pressure might be low.
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