How to Fix LG AC CO Error Code
The 'CO' error code on an LG air conditioner indicates a communication failure between the indoor and outdoor units. This usually happens when the signal cable connecting the two units is loose, damaged, or experiencing electrical interference.
Understanding the CO Error
- The CO error signifies that the indoor unit's main PCB cannot send or receive data from the outdoor unit's PCB.
- This is often caused by loose terminal connections, corroded wiring, or a break in the communication line due to pests or environmental wear.
- In some cases, a power surge can cause the communication modules to hang, requiring a hard reset.
Safe Steps to Try Before Calling a Technician
- Perform a hard reset by turning off the AC circuit breaker for 5-10 minutes to allow the capacitors to discharge and the system to reboot.
- Inspect the outdoor unit for any visible signs of wire damage, such as chewed cables or loose terminal screws.
- Ensure that the power supply to both units is stable and that no other high-power appliances are sharing the same circuit.
Always turn off the main power supply before inspecting any wiring. If you are not comfortable working with electrical connections, please contact a professional technician to avoid the risk of electric shock.
How It Works
-
1
Call or WhatsApp
Tell us the appliance, issue, and your area.
-
2
Technician Visits
We inspect the unit and give an upfront quote.
-
3
Repair & Pay
Approve the quote, repair completed same-day, pay after.
What You Get With Every Repair
If the same issue recurs within 30 days of the repair, we'll fix it again at no extra visit charge.
-
Transparent Pricing
Visit charge, labour, and parts all confirmed before we start, no surprises.
-
24 of 22 Cities Covered
Local technicians across Tamil Nadu, not a call-center dispatch queue. See coverage →
-
Same-Day Service
Most repairs completed the same day, subject to parts availability.
-
All Major Brands
We service LG, Samsung, Daikin and more.
-
Independent Service
Not tied to any manufacturer's targets — we recommend what's actually best for you.
-
Easy Booking
Call or WhatsApp — get your visit confirmed in minutes, no app required.
Frequently Asked Questions
Can I fix the CO error myself?
You can perform a power reset, but if the issue is a damaged communication cable or a faulty PCB, you will need a qualified technician to repair or replace the components.
Does the CO error mean my AC is broken?
Not necessarily. It means the units have stopped 'talking' to each other. It is often a simple wiring issue rather than a total compressor failure.
How long does it take to repair a communication error?
If it is a loose connection, it can be fixed quickly. If the PCB or communication cable needs replacement, it may take longer depending on part availability.
Will my AC cool if the CO error is displayed?
No, the AC will typically stop cooling and the fan may shut off as a safety measure to prevent further damage to the system.
Get a Technician Today
Opens WhatsApp with your details pre-filled — we'll confirm your visit window directly. Trouble opening WhatsApp? Call us instead.