Kenmore Refrigerator Er CO — What It Means & How to Fix It
Also shown as E CO, F CO on some models.
Er CO means the LG-built Kenmore 795/796 display panel and main control board have lost communication with each other.
What this code means
On LG-built Kenmore 795/796 refrigerators, Er CO is a communication fault between the display (user interface) board and the main control board. It's often triggered by a power blip, but a loose harness or a failing board can keep it coming back.
Verify against the model number printed inside the fresh-food section: this is the LG-built Kenmore 795/796 platform, and Er CO is that platform's communication error per LG/Kenmore service-manual code references.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Power blip or surge muddling the boards during a reset | Common | Yes - a clean power cycle often clears it. |
| Loose or corroded harness between the display and main boards | Occasional | Cautious - you can inspect the visible connectors after unplugging. |
| Failing display board or main control board | Occasional | No - board diagnostics and replacement belong to a tech. |
What you can try yourself
- Unplug the refrigerator and leave it off for at least five minutes so both control boards fully power down.
- Plug it back in and note whether the display returns to normal - many Er CO faults are momentary communication glitches.
- If the code reappears, inspect any display-to-control harness you can reach safely after unplugging, reseating connectors gently.
- Persistent Er CO points to a failing board: schedule a tech to test with the service diagnostic before replacing anything.
When to call a technician
- Stop if tracing the harness means dismantling the door or console - delicate ribbon cables are easy to tear.
- Stop if you're tempted to replace boards speculatively: Er CO has multiple causes, and guessing is an expensive path.
Typical professional repair cost: $240-$520
Frequently asked questions
Does Er CO mean my refrigerator stopped cooling?
Not necessarily - cooling can continue even while the display can't talk to the main board. Check temperatures before worrying.
Why does Er CO keep coming back after reset?
A loose harness or a board with a real fault will re-trigger the code every time the boards try to sync.
Sources checked
Error meanings can vary by model. This guide was checked against the documentation above; use the manual for the model number on your own appliance when it differs.
Related Kenmore codes
- Kenmore Refrigerator Er FF Er FF is the LG-built Kenmore 795/796 family's way of saying the freezer fan has stalled, is blocked by ice, or its motor is failing.
- Kenmore Refrigerator Er rF Er rF says the fan in the fresh-food (refrigerator) section of an LG-built Kenmore isn't spinning as it should.
- Kenmore Refrigerator Er dS Er dS flags a problem in the defrost system's temperature sensing on LG-built Kenmore 795/796 refrigerators.
- Kenmore Refrigerator Er dH Er dH is the LG-built Kenmore 795/796 defrost-heater fault - the heating circuit that melts frost off the evaporator isn't working.
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