You may just need to be patient . It has to fill the water heater and all of the lines before it will pressure up and cut off.
You can by-pass the water heater and it will prime faster.
Some units have a series of valves that need to be set at a certain position for different functions. Can't help with this unless we have some pictures.
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2015 DRV Tradition
2014 GMC Duramax DRW Crew
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