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Error code reference

Kenmore Refrigerator Error Code CO E

Communication error between display PCB and main PCB.

Kenmore codesKenmore refrigerator codes

Communication error between display PCB and main PCB.

First step from the service manual

Check for loose connection in CON101 from PCB Display, then check voltage between wires Red to Blue (should be 12V).

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What CO E means on a Kenmore refrigerator

The CO E error code on a Kenmore refrigerator indicates a communication failure between the display PCB (printed circuit board) and the main control PCB. These two boards continuously exchange data signals to coordinate functions like temperature settings, compressor operation, and fan control. When this communication link is interrupted or degraded, the refrigerator triggers CO E to alert that the control system cannot operate reliably.

The diagnostic process begins at connector CON101, which is the primary communication interface on the display PCB. This connector carries the signal and power lines between the two boards, and a loose, corroded, or damaged pin connection here is the most frequent cause of the error. The specified voltage check between the red and blue wires at CON101 should read 12V DC. A reading significantly below 12V or no voltage at all points to a power supply issue on the main PCB, a wiring harness fault, or a failed board.

If the CON101 connection is secure and the 12V supply is confirmed, the fault likely lies in one of the two PCBs themselves. A failed main PCB may not be generating the correct communication signals or supply voltage, while a failed display PCB may not be processing incoming signals correctly. Wiring harness damage between the two boards, including chafed insulation or broken conductors, can also produce an intermittent or permanent CO E condition.

Source: manufacturer service documentation.

Common causes of CO E

  1. 01

    Loose or unseated connector at CON101

    Wiring / connection

    The CON101 connector on the display PCB can work loose over time due to vibration. Inspecting and firmly reseating this connector is the first recommended step and resolves the error in many cases.

  2. 02

    Incorrect or absent 12V supply voltage

    Part replacement

    The red to blue wire pair at CON101 must carry 12V DC for communication to function. A reading below or far from 12V indicates a wiring harness fault or a main PCB that is not supplying proper power to the display board.

  3. 03

    Damaged wiring harness between boards

    Part replacement

    The wiring harness connecting the display PCB and main PCB can suffer from chafed insulation, pinched conductors, or broken wires. Visually inspect the full length of the harness for any signs of damage or wear.

  4. 04

    Failed display PCB

    Part replacement

    If the connector and voltage are both confirmed good, the display PCB itself may have failed and is not processing communication signals correctly. The board would need to be replaced.

  5. 05

    Failed main control PCB

    Part replacement

    A faulty main PCB may fail to generate or transmit the communication signals the display board requires. This is typically diagnosed after ruling out connector issues, wiring faults, and the display PCB.

See the test procedure for each cause

Frequently asked questions about CO E

What does CO E mean on a Kenmore refrigerator?
CO E stands for a communication error between the display PCB and the main control PCB. These two boards must exchange data continuously for the refrigerator to operate correctly. When that communication link fails or is interrupted, the CO E code appears. Common causes include a loose connector at CON101 or a wiring issue between the two boards.
Can I fix the CO E error myself on a Kenmore refrigerator?
In some cases, yes. Start by locating connector CON101 on the display PCB and firmly reseating it, as a loose connection is the most common cause. You can also check the voltage between the red and blue wires at that connector, which should read 12V DC. If reseating the connector does not resolve the issue and voltage is absent or incorrect, further diagnosis or board replacement is typically needed and may require a technician.
Is it safe to keep using my Kenmore refrigerator when CO E is displayed?
A CO E error means the display and main control boards are not communicating properly, which can affect the refrigerator's ability to regulate temperature and manage its systems. It is not advisable to rely on the appliance for food safety until the error is diagnosed and resolved. Check the internal temperature with a thermometer if you need to assess food safety in the short term.
Will resetting my Kenmore refrigerator clear the CO E error?
A power reset, such as unplugging the refrigerator for a few minutes and plugging it back in, may temporarily clear the code if the communication fault was caused by a transient glitch. However, if there is an underlying issue such as a loose connector, wiring fault, or failed PCB, the CO E error will return. A reset is worth trying first, but it is not a substitute for proper diagnosis.
How much does it cost to repair a CO E error on a Kenmore refrigerator?
Repair costs vary depending on the root cause. If only a connector needs reseating, the repair may cost nothing beyond your time. A wiring harness repair or replacement could range from around $50 to $150 in parts. Replacing a display PCB or main control PCB typically runs between $100 and $350 per board depending on the specific model, plus labor costs if a technician performs the work.

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