5
LG 5 Error Code – Communication Error (Indoor->Outdoor)
Air Conditioner · HIGH Severity
What This Error Means
Communication failure from indoor unit to outdoor unit
Diagnostic & Repair Steps
1
Check Communication Wire
Inspect 2-wire cable from indoor to outdoor unit.
Inspect 2-wire cable from indoor to outdoor unit.
INSPECT
~10 min
2
Power Reset
Turn off at breaker, wait 5 min, restart.
Turn off at breaker, wait 5 min, restart.
RESET
~5 min
3
Check Terminal Connections
Reconnect communication wires at both units.
Reconnect communication wires at both units.
CHECK
~10 min
4
Test Wire Continuity
Verify continuity with multimeter. ⚠️ Disconnect power first
Verify continuity with multimeter. ⚠️ Disconnect power first
TEST
~15 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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