CH45
LG Communication Error with Optional Accessories (e.g., Central Controller, Wi-Fi Module)

System displays CH45 and operation is restricted or stopped.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Faulty communication wiring to accessory, Incorrect address or configuration, Failed accessory module

How to Fix / Troubleshooting

Safety: Turn off power before connecting or disconnecting any accessory modules.

Steps:

  • Check accessory wiring: Inspect the communication cable between the indoor unit and accessory (central controller, Wi-Fi kit). Ensure correct polarity and secure connections.
  • Remove accessory (test): Temporarily disconnect the accessory module and restore power. If CH45 clears, the accessory or its wiring is likely at fault.
  • Reconfigure: Follow LG instructions to set addresses or IDs for the accessory if required.

Technician recommended: If CH45 persists even with accessories removed, the indoor PCB communication port may be defective and should be checked by a professional.

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Repair Difficulty

Medium 3/5

Required Part

Wi-Fi / Central Controller Module
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