Kenmore Refrigerator Error Code Er CO1

Er CO1 is a communication error indicating that the Main PCB and the Display PCB have lost contact with each other. The fault is caused by a short circuit or open circuit in the lead wire harness connecting the two boards. The refrigerator's control system detected the break in the data signal and triggered this code to indicate the wiring or a board needs to be inspected.

A communication error between the control boards can affect the refrigerator's ability to properly regulate temperature and respond to control inputs. It is best to address the fault promptly rather than continuing to run the unit. Food safety could be at risk if temperature control is impaired.

Repair costs depend on what needs to be replaced. If the fix is simply reseating a connector or replacing a damaged harness, costs are generally modest, typically in the range of $50 to $150 for parts and labor. If the Display PCB or Main PCB needs replacement, costs can rise to the $150 to $400 range depending on parts pricing and local labor rates.

Start by unplugging the refrigerator and inspecting the wire harness between the Main PCB and the Display PCB for loose connectors, pinched wires, or visible damage. Reconnect any loose connectors and test the harness conductors with a multimeter for continuity and shorts. If the harness is intact, the Display PCB or Main PCB may need to be replaced.

Unplugging the refrigerator for a few minutes may temporarily clear the error, but the code will return if the underlying wiring fault or board failure is not corrected. A reset does not repair a short circuit, open circuit, or damaged component. A proper diagnosis and repair of the wiring harness or affected board is required to resolve the error permanently.