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

What Does CH35 Mean?❓

CH35 means that the indoor and outdoor units are not communicating properly. This can happen due to wiring issues, power interruptions, or faulty control boards. The AC may not start or might shut down during operation.

air-conditioner - Causes of CH35 Error

  • Loose or disconnected communication wires
  • Power supply interruption
  • Faulty PCB (Printed Circuit Board) in indoor or outdoor unit
  • Corroded terminals or connectors
  • Voltage fluctuation or surge

air-conditioner - How to Fix CH35 Error❓

  • Check Power Supply

    1. Ensure power is reaching both units.
    2. Reset circuit breakers.

  • Inspect Wiring Connections

    1. Open terminal covers and check wires between indoor and outdoor units.
    2. Tighten or reconnect if loose.

  • Look for Corrosion

    1. Check terminal blocks for rust or corrosion.
    2. Clean or replace as necessary.

  • Restart the System

    1. Turn off power for 5–10 minutes.
    2. Restore power and monitor behavior.

  • Call a Technician

    1. If issue persists, technician should inspect PCB and internal boards.

air-conditioner - Helpful Tips

  • Install a voltage stabilizer to avoid surges.
  • Avoid moving or tampering with unit wiring.
  • Keep terminals clean and protected from moisture.
  • Get wiring inspected annually.
  • Label communication wires clearly during servicing.

Frequently Asked Questions❓

Question: Can I fix CH35 myself?
Answer: You can check power and loose wires, but PCB issues need a technician.
Question: Does CH35 always mean damaged PCB?
Answer: Not always—many cases are due to wiring or connection issues.
Question: Can the AC run with CH35 error?
Answer: No, it usually prevents startup or operation.

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