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  1. 07-15-2005, 06:58 PM #1
    smworth
    smworth is offline Regular Guest
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    My hot water recirculator has stopped working. The Grundfoss pump is still pumping however there is no circulation?
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  2. 07-15-2005, 07:08 PM #2
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    wallynut
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    grundfoss

    How do you know pump is pumping?
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  3. 07-15-2005, 07:16 PM #3
    smworth
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    I have a rotation tester that I got from The Grundfoss distributor. You hold it up to the end of the motor and it shows you which way the pump is turning and how fast.
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  4. 07-15-2005, 07:23 PM #4
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    wallynut
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    If you know pump is working than I would suspect recirc line should be purged. suspect air pocket, this would stop circulation totally. Or impella problem.
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  5. 07-15-2005, 07:32 PM #5
    artisb
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    Wallynut said exactly what I was thinking. There's probably an air pocket in the line.
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  6. 07-15-2005, 10:03 PM #6
    smworth
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    What about the check valve?
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