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Taco 571-2 Zone Valave Question

I have a Taco 571-2 Zone valve that seems to be stuck.  If I switch it to manual, I get heat.  IS it possibly just the head??  It is hot to the touch, but no water circulating


  • Alan (California Radiant) Forbes
    Check for voltage

    If you've got 24 volts to the powerhead and the valve is not open, replace it.

    If it's hot, that can be a sign of a faulty head. 
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
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