Safety: Turn off power at the breaker before touching pump wiring or terminals.

Check for jams: With power OFF, access Pump 1 and try to rotate the motor shaft or impeller by hand (through the rear fan opening if accessible). It should turn freely. Debris or seized bearings can prevent startup.
Inspect wiring: Confirm that Pump 1's cord or hardwiring is secure at the control pack and that there are no burned connectors.
Thermal overload: If the pump was running hot, allow it to cool for 30–60 minutes and try again. Internal overloads may reset when cool.
Swap test (advanced): If connectors are identical, a technician can temporarily swap Pump 1 and Pump 2 outputs at the board to see if the problem follows the pump or stays with the circuit.
Replace faulty component: A seized pump requires replacement of the Hydropool jet pump assembly. If the pump is good but the board output is dead, the control board or relay must be replaced.

Display shows P1 error; Pump 1 does not start or runs erratically.

Possible Causes