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Kenmore · Refrigerators
Communication Error Between Boards
Quick Answer
Error code Er CO on your Kenmore Refrigerators means: Communication Error Between Boards. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
517835182360412713227248273025
Likely Causes
  1. Wire harness between the main control board and the display/UI board is damaged
  2. One of the control boards has a corrupted firmware or hardware failure
  3. Communication bus connector pins are corroded or bent
  4. Power supply fluctuation interrupted the serial communication between boards
How to Fix It
1
Unplug the refrigerator for 10 minutes to reset both control boards, then plug it back in
2
If the error returns, access the main control board (usually at the rear bottom) and the display board (behind the front panel)
3
Inspect the communication wire harness between both boards for any damage, pinched wires, or loose connectors
4
Reseat all connectors firmly and clean any corroded pins with electrical contact cleaner
5
Replace the main control board first; if the error persists, replace the UI/display board
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Kenmore main control board (model-specific)
UI/display board (model-specific)
Communication wire harness
Electrical contact cleaner
Related Error Codes
Er IFEr FFEr CFEr dHEr dS
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