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

What Does CH05 Error Mean?❓

The CH05 error appears when the indoor unit fails to receive a signal from the outdoor unit or vice versa. This means there is likely a break in communication due to wiring faults, power issues, or a malfunctioning control board. The air conditioner may stop cooling or shut down completely until the issue is resolved.

air-conditioner - What Causes the CH05 Error?

  • Loose or disconnected signal cable
  • Damaged or corroded connector pins
  • Power supply instability
  • Faulty PCB in indoor or outdoor unit
  • Rodent damage to communication wires

air-conditioner - Fixing CH05 Error – Step-by-Step Guide❓

  • Turn Off Power

    1. Switch off the AC unit and unplug it for safety

  • Inspect Communication Wires

    1. Check the wire connecting indoor and outdoor units
    2. Look for signs of wear, cuts, or loose connection

  • Check Terminal Blocks

    1. Ensure all terminal screws are tightened
    2. Clean any corrosion on the terminals

  • Reset the AC

    1. Reconnect power and try running the unit again

  • Call a Technician

    1. If issue persists, have a professional inspect the PCB and wiring harness

air-conditioner - Helpful Tips to Prevent CH05 Error

  • Schedule annual servicing to check for wiring issues
  • Use voltage stabilizer to prevent communication loss
  • Avoid DIY wiring repairs unless trained
  • Protect outdoor unit wires from rodents
  • Keep terminal points dry and dust-free

Common Questions About CH05 Error❓

Question: Can I continue using the AC with CH05 error?
Answer: No. The AC will likely stop working until the communication is restored.
Question: Is CH05 error serious?
Answer: Yes. It can lead to complete system shutdown if not resolved.
Question: What is the repair cost for CH05 issue?
Answer: If it’s wiring-related, it may cost ₹300–₹700. If PCB replacement is needed, it could cost ₹1500 or more.

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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