Conveyor or rack drive does not move in a conveyor-type Champion dishwasher; E12 is displayed.

Safety first: Disconnect power and ensure the conveyor cannot move unexpectedly. Keep hands clear of chains and sprockets.

Troubleshooting steps:

• Inspect for mechanical jams: Remove any racks or objects stuck in the entrance or exit of the machine. Check the Champion conveyor chain and sprockets for foreign objects or bent links.
• Check drive chain and sprockets: Verify the chain is on the sprockets and properly tensioned. Replace broken or severely worn chains and sprockets.
• Test conveyor motor: Access the drive motor. Attempt to rotate the shaft by hand (with power off). If seized, replace the motor/gearbox assembly.
• Verify power and contactor: During a call for conveyor movement, measure voltage at the motor terminals. If no voltage, inspect the conveyor contactor or relay and any associated limit switches. Replace faulty components.
• Check limit and safety switches: Many Champion conveyors use entrance/exit limit switches. Test each switch for proper operation with a multimeter and adjust or replace as needed.

When to call a technician: Conveyor drive systems can be complex; if electrical and mechanical checks are inconclusive, contact a Champion service technician.