Maytag Refrigerator Error Code CO — Communication Error
What this means
The CO error code indicates a communication failure between the refrigerator's main control board and the compressor inverter, fan motors, or other system components. When the control board cannot send signals to the cooling system, the refrigerator may stop cooling entirely. This can be caused by a faulty control board, damaged wiring, or a failed inverter board.
Alternate codes: C0
Step-by-step fix
4 stepsReset the refrigerator
Unplug the refrigerator for 10 minutes, then plug it back in. A temporary communication glitch may clear with a full power cycle.
Wait the full 10 minutes — refrigerator control boards need longer to fully reset than other appliances.
Check wiring connections
Pull the refrigerator away from the wall and access the rear panel. Inspect all wire harness connections to the main control board for loose or corroded plugs.
Moving the refrigerator can sometimes dislodge wire connections.
Inspect the main control board
Examine the control board (usually at the bottom rear) for signs of moisture, burn marks, or swollen capacitors.
Refrigerator control boards are prone to moisture damage from defrost water.
Replace the main control board
If the error persists after resetting and checking connections, the main control board likely needs replacement.
Photograph all connections before removing the old board.
When to call a professional
If the error persists after board replacement, the inverter board or compressor may have a secondary failure requiring professional diagnosis.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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