Jet pump hums but does not start; may trip breaker after a few seconds

Safety first: Turn off power at the GFCI breaker. Do not repeatedly reset a tripping breaker.

A humming pump that will not start is often mechanically bound or has a failed capacitor.

• Check for obstructions: With power off, remove the pump wet end cover and inspect the impeller for debris. Ensure it spins freely by hand.
• Inspect capacitor: Locate the start/run capacitor on the pump motor. Look for bulging, leaking, or burnt smell.
• Replace capacitor if suspect: Discharge the old capacitor safely, then install a matching replacement rated for your American Whirlpool pump motor.
• Test operation: Restore power and briefly run the pump to see if it starts normally.

If the motor shaft is stiff or noisy even with a new capacitor, the motor bearings are likely failing and the pump motor should be replaced.