Pump Runs Automatically But Delivers No Water: Relay or Controller Sync

Pump Starts on Its Own, Runs Dry: Electrical or Control Issue

System used Thursday. That night, pump turned on automatically, had to kill power. Runs when plugged in but delivers no water.

Possible Causes

• Stuck pump relay – Relay welded closed, runs pump continuously.
• Controller/relay out of sync – Controller signals pump but valves don't open.
• Pump loss of prime – But why auto-start?

Need Local Diagnosis

Without system details, hard to pinpoint. Likely a local service person must trace the pump control circuit (relay, pressure switch, controller interlock).

Don't run pump dry—it destroys seals.