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Flotec FP5172 Pump with FP7120 Tank: Pump Won't Start Automatically

New Flotec FP5172 pump, FP7120 tank, 3-wire pressure switch installed. Pump doesn't start automatically. User requests wiring diagram.

Pressure Switch Basics

Matt: "The pressure switch reacts to the dropping pressure of the system. When it hit a set pressure the contacts close and run the motor. The pressure can be adjusted by turn the screw on the switch. Clockwise raises the pressure, counterclockwise lowers."

Diagnosis Offer

No diagram found. Matt offers to review photos emailed to mwelch@chartermi.net: overall pump/tank, plus close-ups of pressure switch with cover open. "There are so many possibilities it's hard to guess."

Common issues: wrong pressure switch range, incorrect wiring (3-wire switch vs 2-wire motor), switch not sensing pressure (bad tube connection), or motor overload tripping.

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