Pump doesn't shut off after initially adding water to system

We brought home our new 2024 T@B 400 Boondock on Monday. I wanted to try out the Alde water heating capability so today I got around to adding a little more water to what the dealer had initially added to the fresh water tank while prepping the camper. I switched the water supply to city water (well, home water) and then turned on the pump. Under Water Pump in the owner's manual it states that when the pump is turned on it will run until the line is pressurized to about 45 psi. The pump began running and then I followed the sequence of events under Initial Start-up process by opening all water outlets, both hot and cold, one by one until the water flow was steady. Apparently once the last faucet is turned off the pump should also turn off. Unfortunately it continued running and did not shut off after I waited for 4-5 minutes. I did power up the Alde water heating function on the propane setting to satisfy my curiosity and it didn't take long to get hot water so I assume that the boiler water jacket is properly pressurized.
The pump is a Shurflo 4008 by-pass pump and the manual for it has a troubleshooting section that lists six things to check, some of which would require opening up the bed platform over the Alde where I assume the pump is located. Tomorrow I will call the dealer to ask if the pump worked properly at the time they prepped the camper but first I want to see if any forum members might have some experiential input and can advise on this.

Edit: I should mention that yesterday I drained the fresh water tank of water that the dealer had added. I should have thought of this when I mentioned above that today I added a bit more to what the dealer had initially added at prep time. Since I drained the tank completely yesterday prior to partially filling it again today, is there a chance that air in the tank has entered the intake line to the pump? Any way to test this?