U.S. Motors pool pump controller shows E15 and the motor runs briefly then stops, repeating this cycle.

Safety first: Turn off power and remove the drive cover only after confirming no voltage is present.

• Inspect sensor connections: Locate the current sensor (shunt resistor or Hall-effect device) on the U.S. Motors drive board. Ensure any plug-in connectors are fully seated.
• Check for board damage: Look for cracked or burned shunt resistors and damaged solder joints.
• Verify actual current: With the cover temporarily in place and power restored, use a clamp meter to measure motor current. If current is normal but E15 indicates over/under current, the sensor circuit is likely faulty.
• Reset controller: Perform a factory reset if available to clear any calibration errors.
• Replace drive module: If E15 persists and hardware damage is visible or readings are inconsistent, replace the pump control board.