zone not working

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Old 10-28-11, 07:09 PM
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zone not working

I have an oil fired boiler with two zones but all of a sudden the zone for the main floor stopped calling foor heat. While I was checking it out at the boiler I removed the valve head (Taco) and the boiler started up. When I put the head on it shut down. Any idea what could be causing this?
 
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Old 10-29-11, 07:22 AM
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when the stat calls the zone the valve moves and the normally open contacts within the valve assembly close to make the boiler. remove the valve head agann and put a wrench on the valve stem and cycle it back and forth easy ..its not swinging all the way to call the boiler in...when you remove it it travels to close the contacts
 
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