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boiler losing pressure

thayer
thayer Member Posts: 2
in THE MAIN WALL
i set expansion tank to 12 psi

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  • thayer
    thayer Member Posts: 2
    boiler losing pressure

    i have an electric allied boiler that will drop its pressure to zero when not used for a day or so. I replaced auto feed, expansion tank, check valve. i closed off all zones to be sure no leak out there, still losing pressure. when boiler kicks back on small amount of water enters through auto feed- not much-pressure shoots back up to 12 psi and all is well..no water loss from boiler anywhere. whats going on? boiler runs great but this is confusing
  • Steve Ebels_3
    Steve Ebels_3 Member Posts: 1,291
    Hmmm

    What's the air pressure in the expansion tank when the system is off, cold and the tank is empty?
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