OK, do you have water in your fresh water tank? If so, disconnect from your city water source, turn the pump switch to on, and then turn on a faucet and see if it will run.
Basically, when the pump is on and a faucet is opened, it detects a drop in pressure and it will run until the faucet is closed and the pressure in the system builds back up. If you are running on city water, the pump may or may not engage since it may not see enough drop in pressure to kick on. To confirm, disconnect from the city water and try it. I don't recommend running the pump without any water in the fresh water tank for extended periods though.
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