🔌 LG Inverter AC CH09 Error Repair | Communication Issue Fix | PCB Board Solution in Chennai

The CH09 error on an LG inverter AC usually indicates a communication error between the indoor and outdoor units. This means the indoor unit is not receiving proper signals from the outdoor unit.
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⚙️ Possible Causes:

1. Communication wire issue (loose or broken connection)
2. Faulty indoor or outdoor PCB (main control board)
3. Power supply fluctuation
4. Corrupted firmware or memory IC
5. Short circuit or burnt components on PCB
LG Inverter AC showing CH09 error? This video explains how to diagnose and fix communication errors between indoor and outdoor units, including wire check, PCB testing, and IC replacement. AC PCB repair service in Chennai available.
🛠️ Step-by-Step Repair Procedure:

1. Check Communication Wiring

Turn off power supply.

Open indoor and outdoor panel.

Trace the 3-core wire between indoor and outdoor units.

Ensure all terminals are tightly screwed and wires are not damaged.

Use a multimeter to test continuity between the units.
2. Test Voltage at Outdoor Unit

Power ON the system.

Measure the DC voltage between terminals (usually between V1 & V2 or L & S) – It should show DC 5V to 65V depending on the model.

If voltage is not present, the indoor PCB may not be sending the signal.
3. Inspect Indoor PCB

Look for burnt marks, swollen capacitors, or damaged tracks.

Test output from communication port (signal pin).

Replace memory IC if corrupted.
4. Inspect Outdoor PCB

Check for voltage input and output.

Look for signs of damage.

Test inverter module if available.
5. Reset the AC

Disconnect the power for 5 minutes and reconnect.

Check if error code clears.

Видео 🔌 LG Inverter AC CH09 Error Repair | Communication Issue Fix | PCB Board Solution in Chennai канала NAVITECH