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    Troyf15e's Avatar
    Troyf15e Posts: 1, Reputation: 1
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    #1

    Nov 4, 2011, 06:43 PM
    How do I know if know if a grundfos circulating pump is bad?
    How do I know if a Grundfos circulating pump is bad?
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #2

    Nov 4, 2011, 06:53 PM
    If the pump has power going to it remove the big screw right in the center of the pump. Stick a pencil or pocket screwdriver into the hole. If the motor is spinning it will vibrate your tool and you will have a small bit of water leaking out. That lets you know the motor is ruining but it may not be pumping water.
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