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haier | air-conditioner – Indoor Unit Communication Failure
Error Codes (undefined): Troubleshooting, Fixes & Prevention Tips explained below.

What Does CH53 Mean?❓

CH53 indicates the indoor unit is not able to send or receive data to/from the main control system or outdoor unit. This typically occurs due to faulty communication wiring, poor PCB connections, or electronic interference affecting data signals.

air-conditioner - Causes of CH53 Error

  • Loose or broken communication wire between indoor unit and controller
  • Short-circuit or open-circuit in communication line
  • Faulty main PCB or indoor unit PCB
  • Incorrect wiring or polarity reversal
  • Electronic interference or power surge

air-conditioner - How to Fix CH53 Error❓

  • Power Off the AC Unit

    1. Switch off power from the circuit breaker.
    2. Wait a few minutes before inspecting.

  • Check Communication Cables

    1. Inspect the 4-core communication wire between indoor and outdoor units.
    2. Look for disconnected, burnt, or damaged wires.

  • Test Continuity

    1. Use a multimeter to verify wire continuity and correct voltage.
    2. Check for reversed wiring or shorted connections.

  • Inspect PCBs

    1. Look for any visible damage on the main PCB and indoor unit PCB.
    2. Replace faulty boards if necessary.

air-conditioner - Helpful Tips

  • Ensure all wiring is tight and well-insulated.
  • Avoid routing communication cables near high-voltage lines.
  • Use only compatible indoor and outdoor units.
  • Label wires properly during installation to avoid polarity issues.
  • Have a technician inspect the system if the error persists.

Frequently Asked Questions❓

Question: Can I fix CH53 by restarting the AC?
Answer: Sometimes a reset helps if it’s a temporary glitch. But persistent issues need inspection.
Question: Does CH53 mean the indoor unit is dead?
Answer: Not necessarily. It could be a communication wiring issue, not a failed unit.
Question: Do I need to replace the PCB for CH53?
Answer: Only if testing confirms the PCB is faulty. Start with wiring checks first.

When to Contact a Technician

If you experience any of the following issues even after completing the recommended troubleshooting steps, please contact an authorized service technician or our support team for further assistance.

  • The same error appears repeatedly after restarting or resetting the unit.
  • Multiple error codes appear simultaneously.
  • The device makes unusual noises, vibrations, or emits a burning smell.
  • The product fails to start, operate, or complete its function despite troubleshooting.
  • There are signs of electrical issues, physical damage, or leakage.
  • An unknown or unlisted error code appears on the display.

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