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Taco 571-2 Zone Valve Issue

bisquits1bisquits1 Member Posts: 7
I have a Taco 571-2 Zone valve that seems to be malfunctioning.  The zone control is lit red for Zone 2 and there is no flow of hot water.  If I switch the valve to manual, I do get flow.  Is it possible that just the head of the valve is bad???  By twisting the valve to remove the head, will there be any water loss??


  • kcoppkcopp Member Posts: 2,522
    the head is...

    replaceable w/o the water loss. Wait for the call for heat to  be off before doing that allowing the piston to cool.
  • bisquits1bisquits1 Member Posts: 7
    Taco 571-2

    Thanks for the info, waiting for Grundfos to come out with Zone Valves so I can try one of those ALPHA ECM pumps.  Old system, but trying to make it more efficient.
  • bisquits1bisquits1 Member Posts: 7
    manual vs auto

    If I switch the valve to manual, will the zone continue to just run??  Probably not too good on the overall run time of the boiler??
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