I'm not sure I'm understanding what you are saying, but, if you've ran water thru the "system" a couple of times while "summerizing" but not included the HWH then you will have what you are experiencing. The hwh tank is empty. When you flip the bypass to fill it it's got to pump 6 gal. or more to fill the tank so it is going to run for a while. First and foremost make sure you have nothing open; faucets, shower head, outside shower, leaky pressure valve on HWH or leaky drain plug. No leaks? Make sure you turn a faucet on to let the pressure push the water out and get the air out - do it for hot and cold. Hot will take a bit while the air purges from the tank. When you have all the air out of the tank and lines the pump will just come on when you are using water.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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