21

LG 21 Error Code – DC Peak Error / IPM Fault

Air Conditioner · CRITICAL Severity

CRITICAL severity Air Conditioner Model: LG LS091HSV Indoor Unit
What This Error Means
DC peak error / IPM fault; compressor DC voltage was too high
Diagnostic & Repair Steps
1
Power Off Immediately
DC peak/IPM fault is critical. 🔧 None
RESET ~2 min
2
Inspect Outdoor PCB IPM
Check for burn marks or damage. 🔧 Flashlight ⚠️ Disconnect and wait 10 min
INSPECT ~15 min
3
Check Compressor Windings
Measure resistance and insulation. 🔧 Multimeter, megger
TEST ~20 min
4
Check Refrigerant Charge
Incorrect charge causes overcurrent. 🔧 Manifold gauge set ⚠️ Certified technician only
TEST ~20 min
5
Refer to LG Service Manual
Visit www.lg-dfs.com for detailed troubleshooting. 🔧 Service manual
CHECK ~10 min

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