Display shows P1 ERR or P1 FAIL; pump 1 does not run or trips breaker.

Safety first: Turn off power at the GFCI breaker before working on pumps or wiring.

• Step 1 – Try to run pump 1: With power on, press the JETS 1 button and listen. A loud hum with no rotation suggests a seized motor; immediate breaker trip suggests a short.
• Step 2 – Inspect wiring: With power off, check the pump 1 cable from the motor to the control pack for damage or loose connections.
• Step 3 – Check for shaft rotation: Remove the rear motor cover and attempt to turn the shaft by hand with power off. If it is stuck, the pump may be seized.
• Step 4 – Test motor windings: Use a multimeter to check resistance between motor leads and to ground. Very low resistance or continuity to ground indicates a shorted motor.
• Step 5 – Replace pump or motor: If the motor is seized or shorted, replace the pump 1 assembly with a Nordic-specified pump.
• Step 6 – Evaluate control board: If the pump tests good but never receives power, the pump 1 relay on the control board may be defective.