The CH 05 error on LG air conditioners is a common issue faced by many users in Singapore. This error code usually points to a communication problem between the indoor and outdoor units. If you see this error on your display panel, your aircon might stop cooling or functioning properly. Here’s what you need to know about the CH 05 error and how to deal with it effectively.
What Is the LG CH 05 Error Code?
The CH 05 error means there is a communication failure between the indoor unit and the outdoor unit of your LG air conditioner. The system is unable to receive or send signals between the two units, which prevents proper operation.
In Singapore, where air conditioners are used often due to the hot and humid weather, this error can be frustrating, especially if it happens during peak hours or in the middle of the night.
Causes of CH 05 Error
Several factors can lead to the CH 05 error:
1. Wiring Issues
Loose or damaged wiring between the indoor and outdoor units is a common reason. Cables may wear out over time or be affected by weather conditions in outdoor spaces like HDB service yards or balconies.
2. Faulty PCB (Printed Circuit Board)
If the mainboard inside either unit is faulty, it can prevent communication between them.
3. Power Fluctuations
Sudden voltage changes or power trips, which sometimes happen in older buildings in Singapore, can also cause the error.
4. Outdoor Unit Problems
If the outdoor unit is not receiving power or is overheating, it can lead to the CH 05 code.
5. Improper Installation
If the system was not installed by an experienced technician, communication errors may arise later.
What Should You Do If You See CH 05?
1. Reset the Power
Turn off the aircon using the remote. Then switch off the circuit breaker for about 10 minutes. Turn it back on and check if the error clears.
2. Check the Wiring (Only If You Know How)
If you are confident and have some experience with electronics, you can check if the wiring between indoor and outdoor units is intact. Otherwise, skip this step for safety.
3. Call a Certified Aircon Technician
If the error does not go away, it’s best to contact a qualified aircon servicing company in Singapore. Licensed technicians can perform diagnostic tests to check wiring, PCBs, and communication signals using proper tools.
Average Repair Cost in Singapore
Repair costs depend on the cause. Here’s a rough estimate:
| Issue | Estimated Cost (SGD) |
| Loose wiring | $60 – $100 |
| PCB replacement | $180 – $300 |
| Outdoor unit repair | $100 – $250 |
| Full system check-up | $60 – $90 |
Note: Always ask for a quote before agreeing to repair services.
Tips to Prevent Future CH 05 Errors
- Use a voltage stabilizer if your area has frequent power trips.
- Schedule regular maintenance at least once every 3 to 4 months.
- Choose reliable aircon brands and certified installers.
- Avoid overloading your aircon system, especially during hot afternoons.
FAQ
What causes the LG CH 05 error?
It usually happens due to poor communication between the indoor and outdoor units. Common causes include damaged wires, PCB failure, or power issues.
Can I fix the CH 05 error myself?
You can try resetting the power, but most cases require a professional aircon technician.
Is the CH 05 error dangerous?
No, it’s not dangerous, but it can stop your aircon from working. It’s better to address it early to avoid bigger repair costs.
How long does it take to fix?
Most repairs can be done within 1 to 2 hours, depending on the issue.
How do I find a reliable technician in Singapore?
Look for BCA-licensed aircon companies or search for reviews on platforms like Google Maps or Carousell Services.
