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Spot free unit

I cut one line at the check valve before the bay and held the spot free relay and it spit first, let off it spit again, let off than had a good flow and worked at the bay. the second bay did the same thing and nothing coming out at all. how can I prime water to the line. looks like one rubber push button on the spot free unit is the motor and one is a pump, they both come on when pushed, now water feeding out.
 
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