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Error code reference

Kenmore Refrigerator Error Code CO

Communication error between Main PCB and Display PCB

Kenmore codesKenmore refrigerator codes
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What the CO error code actually means

The CO error means your refrigerator's main control board and its display panel have lost the ability to communicate with each other. This is usually caused by a wiring problem between the two components. Your refrigerator should still be running normally, but the issue should be checked out to keep everything working correctly.

Diagnostic procedure

The full CO procedure

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1
Confirm the fault
Power cycle the unit: switch off the breaker for 60 seconds, then restore power. If the code returns, the fault is persistent and the procedure below isolates the cause.
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Most common causes of CO

Ranked by how often they cause this code
  1. 1Loose or disconnected wire harness connector
  2. 2Damaged or pinched lead wire
  3. 3Open circuit in lead wire
  4. 4Short circuit in lead wire
  5. 5Faulty Main PCB or Display PCB

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Questions people ask about CO

What does CO mean on a Kenmore refrigerator?
The CO code indicates a communication error between the Main PCB and the Display PCB. It is triggered when the lead wire connecting these two boards develops a short circuit or an open circuit. The good news is that all normal refrigerator functions are reported to continue operating despite this fault.
Is my food safe when a Kenmore refrigerator shows the CO error?
According to the error code data, all systems continue normal operation when the CO code appears, meaning the refrigerator should still be cooling. Monitor your temperatures with a thermometer to confirm, and address the fault promptly to avoid any future control issues.
How much does it cost to repair the CO error on a Kenmore refrigerator?
Repair costs vary depending on the cause. If only the lead wire harness needs replacement, parts and labor typically range from around $75 to $200. If a Main PCB or Display PCB replacement is required, costs can range from $150 to $400 or more depending on part availability and local labor rates.
Will resetting my Kenmore refrigerator clear the CO error code?
A power reset may temporarily clear the CO code, but if the underlying wiring fault remains, the code will return. A lasting fix requires diagnosing and repairing the lead wire or connector between the Main PCB and Display PCB rather than relying on a reset alone.
Can I fix the CO error on my Kenmore refrigerator myself?
A knowledgeable DIYer can start by inspecting the wire harness between the two boards for loose connectors, visible damage, or pinched sections. Testing for continuity and shorts with a multimeter is also within reach for someone comfortable with basic electrical diagnostics. If the harness tests good and the fault persists, board replacement is best left to a qualified technician.

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