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First floor calls for heat boiler (short cycle) banging pipes

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jogrady
jogrady Member Posts: 5
in THE MAIN WALL
I changed the thermostat and replaced expansion tank which was full of water. The two other zones work fine. Could it be the zone valve is bad and causing this problem

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  • Jamie Hall
    Jamie Hall Member Posts: 23,283
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    It could. Could be a few other things, too...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • JUGHNE
    JUGHNE Member Posts: 11,061
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    Would you have a Honeywell zone valve installed backwards?
  • HVACNUT
    HVACNUT Member Posts: 5,834
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    You replaced the thermostat and extrol to remedy the problem? Sounds like it's air bound. How's the air eliminator(s)?
  • JUGHNE
    JUGHNE Member Posts: 11,061
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    Is the zone valve opening? Some have manual over ride.
    Return valve closed or flow/check not opening?

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