Display shows SY CE; refrigerator may not cool properly; controls may be unresponsive or intermittent.

Safety first: Always disconnect power before accessing control boards. Electronic components are sensitive to static; avoid touching circuit traces.

Steps to resolve:

• Power cycle: Unplug the refrigerator or turn off the circuit breaker for 5 minutes, then restore power. This can clear transient communication faults.
• Check display panel: Confirm that buttons respond and the display lights evenly. If some buttons are dead or flicker, the UI may be failing.
• Inspect top/hinge harness: On many KitchenAid French-door models, the UI harness runs through the top hinge. Remove the hinge cover (with power off) and check for pinched or broken wires.
• Reseat connectors: If you are comfortable, remove the rear access cover to the main control board. Gently unplug and replug the UI harness connector, ensuring it is fully seated.

If SY CE persists after a reset and harness inspection, either the user interface or main control board will need replacement. This diagnosis is best confirmed by a technician with access to the service manual and test procedures.