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smworth
07-15-2005, 06:58 PM
My hot water recirculator has stopped working. The Grundfoss pump is still pumping however there is no circulation?
wallynut
07-15-2005, 07:08 PM
How do you know pump is pumping?
smworth
07-15-2005, 07:16 PM
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.
wallynut
07-15-2005, 07:23 PM
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.
artisb
07-15-2005, 07:32 PM
Wallynut said exactly what I was thinking. There's probably an air pocket in the line.
smworth
07-15-2005, 10:03 PM
What about the check valve?