Dishwasher displays C9; unit may stop or pause, sometimes with unusual noises from the lower area.

Safety first: Turn off power at the breaker and shut off water. Use caution when working under the unit.

• Check spray arms: Remove and inspect all spray arms. Clean out any blocked jets and ensure they spin freely when reinstalled.
• Inspect sump area: Remove the lower rack and filter. Look for debris in the sump that could interfere with the diverter mechanism.
• Access diverter assembly: Pull the dishwasher out and remove the bottom panel. Locate the diverter motor/valve attached to the sump or circulation system.
• Check for mechanical jam: Disconnect power and wiring to the diverter. Remove the diverter assembly and inspect for broken plastic pieces, foreign objects, or mineral buildup preventing movement.
• Test diverter motor: Use a multimeter to check for proper resistance across the motor terminals. An open or shorted motor requires replacement.
• Reassemble and test: Reinstall the diverter, ensure all hoses and clamps are secure, restore power, and run a cycle. If C9 returns, the control board or position sensor may be faulty and professional service is advised.