28
LG 28 Error Code – Inverter Compressor DC Voltage High
Air Conditioner · CRITICAL Severity
What This Error Means
Inverter compressor DC voltage is too high
Diagnostic & Repair Steps
1
Power Off Immediately
High DC voltage is a critical electrical fault.
High DC voltage is a critical electrical fault.
RESET
~2 min
2
Check Power Supply
Measure incoming AC voltage.
Measure incoming AC voltage.
TEST
~10 min
3
Inspect Outdoor PCB
Check voltage regulation circuit. ⚠️ Disconnect and wait 10 min
Check voltage regulation circuit. ⚠️ Disconnect and wait 10 min
INSPECT
~15 min
4
Replace Outdoor PCB
If voltage regulation faulty.
If voltage regulation faulty.
REPLACE
~30 min
5
Refer to LG Service Manual
Visit www.lg-dfs.com for detailed troubleshooting.
Visit www.lg-dfs.com for detailed troubleshooting.
CHECK
~10 min
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