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LG Refrigerators

Error Code CO E

Communication Error — poor communication between Main PCB MICOM and Display PCB MICOM; may be caused by loose hinge connection, poor Tx/Rx connection

Moderate

Address soon - your appliance may not work properly

Also displayed as: CO E

How to Fix

  1. 1

    Check all connectors between main board and display board for loose connections. Reconnect any loose connectors.

  2. 2

    Measure voltage at CON101 pin 7 to pin 6: should be 12V. If absent, replace Main PCB.

  3. 3

    Measure voltage at CON101 pin 3 to pin 6: should be 5V. If absent, replace Main PCB.

  4. 4

    Measure voltage at CON101 pin 5 to pin 6: should oscillate (not fixed 0V or 5V). If fixed, replace Display PCB.

  5. 5

    Measure voltage at CON101 pin 4 to pin 6: should oscillate (not fixed 0V or 5V). If fixed, replace Main PCB.

  6. 6

    Measure voltage at CON5 pin 4 to pin 6: should oscillate. If fixed, replace Display PCB.

  7. 7

    Measure voltage at CON5 pin 4 to pin 8: should oscillate. If fixed, replace Main PCB.

  8. 8

    Check hinge wire harness for pinching or damage causing intermittent communication loss.

  9. 9

    If all checks pass, explain to customer.

This Error Applies To

LG LMXS28626D Series Refrigerators

Service manual exact match: LMXS28626DService manual exact match: LMXS28626SService manual exact match: LFXS28566DService manual exact match: LFXS28566SService manual exact match: LFXS28968DService manual exact match: LFXS28968S

Related Error Codes

HS E

Humidity Sensor Error — short or disconnection of humidity sensor

rt E

Room Temperature Sensor Error — short or disconnection of room temperature sensor

FS E

Freezer Sensor Error — short or open circuit on freezer temperature sensor

rS E

Refrigerator Sensor Error — short or open circuit on refrigerator compartment temperature sensor

IS E

Icing Sensor Error — short or open circuit on icemaker compartment sensor. If IS E displays without user input, indicates Icing Sensor fault specifically.

dS F

Defrost Sensor Error — short or open circuit on defrost/evaporator sensor

It E

Ice Maker Motor Error — motor, gear, Hall IC, or operation circuit within icemaker kit failed to cycle; ice does not drop when IM Test S/W is pressed

dH F

Defrost Heater Error — poor defrost due to temperature fuse disconnection, heater disconnection, drain jam, or failed heater relay; triggered after 2 consecutive incomplete defrost cycles

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