Lg Refrigerator Error Er CO

⚡ Quick Answer: The LG refrigerator error code Er CO indicates a communication failure between the main control board and the display PCB. This issue often results in... ✅ DIY Fixable

What Does Error Er CO Mean?

The LG refrigerator error code Er CO indicates a communication failure between the main control board and the display PCB. This issue often results in a non-cooling refrigerator, accompanied by symptoms such as an unresponsive display and disabled functions. To resolve this, you may need to inspect wiring connections or replace faulty components like the display PCB or main control board.

Common Symptoms:

  • Display shows 'Er CO' or 'E CO' error
  • Functions may be disabled or display unresponsive
  • Fridge may not operate normally until error is resolved

Possible Causes

  • Communication failure between the main control board and the display PCB (high)
  • Loose or disconnected wiring harness between control board and display (medium)
  • Faulty display PCB (medium)
  • Faulty main control board (medium)

How to Fix Error Er CO

DIY Fix Perform a power reset

  1. Unplug the refrigerator from the power outlet or turn off the dedicated circuit breaker.
  2. Wait at least 5 minutes.
  3. Restore power and observe if the error code clears.

Technician Only Inspect wiring and communication harness

  1. Disconnect power to the refrigerator.
  2. Remove access panels to locate the wiring harness between the main control board and display PCB.
  3. Inspect connectors and wires for looseness, corrosion, or damage.
  4. Reseat or replace the harness if defects are found.

Parts needed: Wire harness, Connectors

Technician Only Replace faulty display PCB or main control board

  1. Power off and access the control boards.
  2. Determine which board (display or main control) is faulty via testing or inspection.
  3. Replace the defective board with an OEM part matching the refrigerator model.
  4. Reassemble and test the refrigerator for proper operation.

Parts needed: Display PCB, Main control board

🛑 When to Call a Pro:
  • If the error persists after a power reset
  • If there is no experience with internal control board inspection or replacement
  • If wiring issues are suspected but not easily accessible

Technical Specifications

wattage 200W
component Compressor
resistance 3-5 ohms
part_number LG 4681JA2006A
voltage_rating 120V AC

Common Questions

What does Er CO error mean on LG refrigerator?

Er CO indicates a communication failure between the main control board and the display PCB, leading to non-cooling and unresponsive functions.

Can I fix LG refrigerator Er CO error myself?

Yes, you can perform a power reset by unplugging the refrigerator for 5 minutes to see if the error clears.

How much does it cost to fix Er CO error?

Estimated repair costs range from $10–$50 for parts, plus labor costs depending on the technician.

When should I call a technician for Er CO?

Call a technician if the error persists after a power reset or if you're uncomfortable inspecting or replacing internal components.

Sources & References

Data last verified: 2026-01-10

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