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Thought I'd follow up on this having resolved it, though I'm not sure how useful it will be to anyone since I don't know why it's resolved. I took the pump apart to have a look at the cartridge and see if I could see anything obviously wrong with it. I plugged in the open pump and the little...

Thanks for the responses. Changing the whole pump is an option, though I'd prefer to avoid it if possible--there are valves and unions on both sides. I'm no plumber, but I can (unattractively) sweat what I need to. New vs. repair part is about $200 (assuming the timer module is reusable) vs...

Hi, The recirc pump that was installed in the house when I bought it is no longer working. I contacted Grundfos and they said one service part is available, a replacement cartridge kit. I assume it's accessible by removing the screws in the photo? What is the best way to diagnose whether...