The Kenmore refrigerator Er CO code appears on LG-built 795 and 796-series models and indicates a communications problem between the main control board and the display panel, rather than a problem with cooling itself. It is worth understanding early that this code is unrelated to compressor or refrigerant issues, which can save you from unnecessary parts replacement.
Why This Code Only Applies to Certain Kenmore Models
Kenmore does not build its own appliances — the badge covers refrigerators manufactured by contracted OEMs, and the model number’s first three digits tell you who actually built yours. A 795 or 796 prefix confirms an LG-built unit, which is why it displays LG’s specific two-letter code system, including Er CO. Models with a 253, 587, 106, or 363 prefix use entirely different code sets from Frigidaire, Whirlpool, or GE respectively; consult our full refrigerator error codes guide to confirm which chart matches your model before assuming Er CO applies.
What Causes the Er CO Communications Problem
Er CO typically traces back to one of a handful of causes: a loose or damaged wiring harness connector between the main control board and the display board, a display board that has failed internally, a main control board failure, or in rare cases a power surge that corrupted the board’s communication routine. Because the compressor and sealed system usually keep running normally behind the scenes, the refrigerator may still be cooling even while the display shows the problem.
First Checks Before Calling for Service
- Unplug the refrigerator for two full minutes to force a hard reset of both boards, then restore power.
- Check that the unit is on a stable outlet and not sharing a circuit prone to voltage fluctuation.
- Feel whether the fresh-food and freezer sections are still cold — if so, the issue is isolated to the display communication path, not the cooling system.
- Avoid repeatedly power-cycling the unit if the code returns immediately, since that points to a hardware problem rather than a one-time glitch.
When to Call an Experienced Technician
Because Er CO can stem from either board or the harness connecting them, proper diagnosis requires testing continuity and board function rather than guessing which part to replace. An experienced independent technician can isolate whether the display board, main board, or wiring harness is responsible, and will install genuine OEM parts matched to your LG-built model so the boards communicate correctly going forward.
How to Prevent Board Communication Problems
- Use a dedicated, properly grounded outlet for the refrigerator.
- Consider a surge protector in areas with frequent power fluctuations or storms.
- Avoid unplugging and replugging the unit repeatedly, which can stress board connectors over time.
It is also worth knowing that a temporary Er CO reading right after a power outage or storm is not automatically a hardware failure — many LG-built control boards briefly lose synchronization with the display during a power event and recover on their own once power stabilizes and the unit completes a full reset cycle. Give the refrigerator a few minutes after the reset before concluding the problem is permanent, and keep an eye on whether the code returns within the next day or two, since a recurring Er CO is the stronger signal that a board or connector genuinely needs replacement.
Our refrigerator repair team diagnoses Er CO and other LG-built error codes on Kenmore 795-series refrigerators every week, with every repair backed by a 30-day labor warranty and genuine OEM parts. We are an independent service, not affiliated with Kenmore, Sears, or Transformco. If your unit is also showing frost buildup or fan noise, see our guide to the Kenmore refrigerator Er FF code. Check supported models, browse service locations, or visit kenmore.com for official product resources. Ready for help? Schedule service now.
