Dishwasher displays C9; may not complete cycle and may have unusual motor noises.

Safety: Disconnect power and turn off water before accessing the base of the dishwasher.

• Listen for motor behavior: When the unit attempts to wash (before disconnecting power), note whether the motor hums, buzzes, or is silent. A loud hum with no water movement suggests a seized motor.
• Inspect circulation pump: Remove the toe kick and access the circulation pump attached to the sump. Check for leaks, burn marks, or melted plastic.
• Check for obstructions: If possible, remove the pump from the sump and inspect the impeller for broken pieces or foreign objects.
• Test motor windings: With a multimeter, measure resistance across the motor terminals. An open circuit indicates a failed motor.

If the motor is seized, open, or shows signs of overheating, replace the circulation pump/motor assembly. Because this involves water seals and electrical connections, many homeowners prefer to have a technician perform this repair.