Second the no sense
If the pump was running backward it would suck air in from the bowl top and blow bubbles into the holding tank.
Several Questions, Did it pump water when your dealer did the demo walk through?
Do you have enough water in it? If the initial charge is not well up into the green area ( assuming the gauge is correct) it will not pump the correct amount of water. I would add another gallon or two before I switched the wiring,
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