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Old 04-13-2010, 06:52 PM   #1
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blockage in heating system


I live in a 3 story house that is heated with hot water. We are getting heat in only the back half of the house. Heat will not flow to front half. We have replaced pump, thermostat, and installed a bleeder on the feed line to the front of the house. Have bled the system several times with no success in getting heat to return. Could this be a mechanical issue in the radiator valves? If airbound, bleeding does not seem to work.

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Old 04-13-2010, 08:56 PM   #2
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blockage in heating system


it is air bound. you may need to increase the pressure to force it out. Also you may need to add bleeder valves at the heat units.

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Old 04-13-2010, 09:31 PM   #3
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blockage in heating system


So when you bleed you are getting water out of the bleeders ?
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Old 04-13-2010, 09:56 PM   #4
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blockage in heating system


Yes, water did come out of radiators when bled. Also, we did install a bleeder valve and still no heat. Have you heard of a "swirl bleeder?"
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Old 04-13-2010, 10:06 PM   #5
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blockage in heating system


When it calls for heat is the recirc pump running ?
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Old 04-13-2010, 10:10 PM   #6
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blockage in heating system


yes, the circulating pump is running when it calls for heat
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Old 04-13-2010, 10:12 PM   #7
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blockage in heating system


Is it possible that there is a mechanical blockage in one of the radiator stem valves? If so, how can I determine which radiator is blocked?
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Old 04-14-2010, 07:01 AM   #8
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blockage in heating system


Do you have 1, or 2 circulators? Is it a zoned system, that you have 2 thermostats?

If you have 2 zones/circulators. Is it possible that you have the circulator installed pumping in the wrong direction?

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