LG Error Code CH21
Outdoor DC link voltage error
Error Code Summary
| Brand | LG |
| Error Code | CH21 |
| Meaning | Outdoor DC link voltage error |
| Cause | DC bus voltage abnormal |
| Recommended Action | Check power supply, inverter board |
How to Fix LG Error CH21
- 1
Power Cycle the Unit
Turn off the unit at the breaker, wait 5 minutes, then restore power. Some errors auto-clear after a restart.
- 2
Identify the Issue
Error CH21 means: Outdoor DC link voltage error. The most common cause is: DC bus voltage abnormal.
- 3
Take Corrective Action
Check power supply, inverter board
- 4
Test the System
After completing repairs, run the system and monitor for the error code. If it recurs, the issue may require professional diagnosis.
Safety Notice
Always disconnect power before performing any electrical work. If you're not a certified HVAC technician, contact a qualified professional for repairs involving refrigerant, electrical components, or compressor work.
Frequently Asked Questions
What does LG error code CH21 mean?
LG error code CH21 indicates: Outdoor DC link voltage error. This is typically caused by: DC bus voltage abnormal.
How do I fix LG error code CH21?
To fix LG error code CH21: Check power supply, inverter board. If the error persists after these steps, contact a qualified HVAC technician.
Is LG error code CH21 serious?
Error code CH21 (Outdoor DC link voltage error) should be addressed promptly to prevent further damage to your LG system. Always turn off the unit if you notice unusual sounds, smells, or continued malfunction.