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midea | air-conditioner Error Codes: Troubleshooting, Fixes & Prevention Tips explained below.

What Does CH93 Mean?❓

CH93 indicates that the indoor and outdoor units are not exchanging information properly. This communication is essential for synchronized cooling or heating. The issue may stem from wiring faults, board failures, or electromagnetic interference disrupting the signal.

air-conditioner - Causes of CH93 Error

  • Loose or broken communication wire between indoor and outdoor units
  • Faulty PCB (Printed Circuit Board) in either unit
  • Voltage fluctuations or electrical noise interfering with signal
  • Incorrect wiring connections during installation or servicing
  • Water damage or corrosion on control terminals

air-conditioner - How to Fix CH93 Error❓

  • Power Reset

    1. Turn off the main power to the AC.
    2. Wait 5–10 minutes and turn it back on.

  • Inspect Wiring Connections

    1. Check the communication cable between indoor and outdoor units.
    2. Look for loose plugs, corrosion, or burn marks.

  • Test Voltage Levels

    1. Use a multimeter to check DC voltage across communication lines.
    2. Abnormal readings may indicate PCB issues.

  • Check Control Boards

    1. Inspect indoor and outdoor PCBs for damage or loose connectors.
    2. Replace the faulty board if signal output is missing.

  • Shield Communication Wires

    1. Ensure communication wires are not running close to high-voltage lines.
    2. Use shielded cables if needed to reduce interference.

air-conditioner - Helpful Tips

  • Always isolate power before checking internal wires.
  • Label wires properly when disconnecting for service.
  • Use original LG spare parts for board replacements.
  • Protect wires with conduits outdoors to avoid moisture damage.
  • Schedule periodic maintenance to catch connection issues early.

Frequently Asked Questions❓

Question: Is CH93 error serious?
Answer: Yes. It disables proper operation and may lead to system shutdown or miscommunication.
Question: Can I fix CH93 by just resetting the AC?
Answer: Sometimes, but it usually points to deeper issues like faulty wiring or a board failure.
Question: Do I need to replace both indoor and outdoor PCBs?
Answer: Not always. A technician can test and identify which PCB is faulty before replacing.

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