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Armstrong Astro 230CI water pump loud

One of my Armstrong Astro water pumps is suddenly making a loud noise compared to the other 5 pumps what can I do to fix that issue? See attached pictures


  • hot_rod
    hot_rod Member Posts: 21,898
    Carefully loosen that large screw and see if any air vents out. Air trapped in the circulator is one common noise.

    If it is more of a squeal, could be the bearing is fried, the motor will need to be replaced. Is it circulating the water ok?

    If a large pocket of air traps it will stop flowing and often the motor gets very hot to the touch. This condition is when the bearings can be compromised.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream