LC
Daikin LC Error Code – Malfunction of Transmission Between Control and Inverter PCB
Air Conditioner · HIGH Severity
What This Error Means
Defective connection between inverter PCB and control PCB, external noise or defective inverter compressor
Diagnostic & Repair Steps
1
Check Communication Wire
Inspect the communication cable between indoor and outdoor unit. Look for cuts, pinches, or disconnections.
Inspect the communication cable between indoor and outdoor unit. Look for cuts, pinches, or disconnections.
INSPECT
~10 min
2
Check Terminal Block Connections
Verify correct wire connections at both indoor and outdoor terminal blocks. Ensure wires are on correct terminals (L, N, 1, 2, 3 or S). ⚠️ Disconnect power before inspecting terminal connections
Verify correct wire connections at both indoor and outdoor terminal blocks. Ensure wires are on correct terminals (L, N, 1, 2, 3 or S). ⚠️ Disconnect power before inspecting terminal connections
CHECK
~10 min
3
Test Communication Signal
Set multimeter to AC Volts. Measure between communication terminals while unit is powered. Should show ~12-24V AC pulsing signal.
Set multimeter to AC Volts. Measure between communication terminals while unit is powered. Should show ~12-24V AC pulsing signal.
TEST
~15 min
4
Check PCB for Damage
Inspect indoor and outdoor unit PCBs for burnt components, swollen capacitors, or visible physical damage. ⚠️ Discharge capacitors before handling PCB
Inspect indoor and outdoor unit PCBs for burnt components, swollen capacitors, or visible physical damage. ⚠️ Discharge capacitors before handling PCB
INSPECT
~10 min
5
Replace Faulty PCB
If wiring is intact but no signal is present, replace the faulty PCB (usually indoor PCB first, then outdoor).
If wiring is intact but no signal is present, replace the faulty PCB (usually indoor PCB first, then outdoor).
REPLACE
~30 min
Need professional PCB repair in Colombo?
Daikin LC errors often require board-level repair. Bottrixx, a trusted electronics repair company in Colombo 02, diagnoses and repairs Air Conditioner PCBs with fast turnaround and same-day service available.