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Error Code Reference

KitchenAid Refrigerator Error Code Er CO

This error code indicates a communication or control board malfunction on your KitchenAid refrigerator. It typically means the main control board is unable to properly communicate with one or more of the appliance's electronic components or sensors.

Technical Advisory
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Signs

What you may observe

• Refrigerator compressor not running or cycling irregularly • Freezer or fresh food section not maintaining proper temperature • Ice maker not producing ice or dispensing ice/water inconsistently • Control panel displays flickering or unresponsive touchscreen • Refrigerator running continuously without normal cooling cycles • Fan motors not operating • Error code Er CO persists even after door closure • Some electronic features may not respond to user input

Possible Causes

Root causes behind this error

• Power supply voltage fluctuations or insufficient electrical current to the control board • Loose or corroded electrical connections between the main control board and component harnesses • Defective main control board or circuit board malfunction • Failed communication cable between control board and display panel • Compressor relay or start device failure • Sensor malfunction preventing proper signal transmission to control board • Power surge or electrical spike damage to control board components • Frost accumulation blocking airflow sensors • Defective ice maker control module • Improper grounding of the appliance

Safety Checks You Can Do

Steps you can try at home safely

• Check that your home circuit breaker for the refrigerator is in the ON position; if tripped, reset it by switching OFF then ON • Ensure both the refrigerator and freezer doors are fully closed and sealing properly • Verify that the temperature controls are set to normal settings (typically 37-40°F for refrigerator, 0°F for freezer) • Inspect the air vents inside both compartments to ensure they are not blocked by food items or ice buildup • Unplug the refrigerator from the wall outlet or turn off the dedicated circuit breaker for 60 seconds, then restore power to perform a complete system reset • Allow the refrigerator to run for 15-20 minutes after reset to see if the error code clears • Check the rear of the refrigerator to ensure proper airflow around the condenser coils and that the unit is not pushed flush against the wall • If accessible without disassembly, gently vacuum any dust or debris from the condenser coils at the rear or bottom of the unit • Confirm the refrigerator has adequate clearance (at least 1 inch on sides and rear) for proper air circulation • Make sure the appliance is connected to a standard 120V grounded outlet and not plugged into an extension cord or power strip
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