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

What Does CH45 Mean?❓

CH45 appears when the AC’s control board detects irregular signals or no signal from the middle pipe thermistor located in the condenser unit. This sensor provides critical temperature data for safe and efficient operation. If it’s faulty or out of range, the AC may stop functioning properly.

air-conditioner - Causes of CH45 Error

  • Dislodged or disconnected middle pipe thermistor
  • Sensor failure due to prolonged use or heat damage
  • Short circuit or open circuit in sensor wiring
  • Corroded or loose connections at the PCB
  • Faulty outdoor control board misreading temperature signals

air-conditioner - How to Fix CH45 Error❓

  • Turn Off the AC and Access Outdoor Unit

    1. Always shut down power before opening the outdoor unit.
    2. Locate the middle pipe thermistor mounted on the condenser piping.

  • Check Thermistor Connection

    1. Ensure the sensor is securely attached and wires are intact.
    2. Look for signs of corrosion or water damage.

  • Test and Replace Sensor

    1. Use a multimeter to check resistance.
    2. If reading is off, replace with a genuine LG sensor.

  • Inspect PCB if Sensor is Fine

    1. If sensor is working, inspect the control board for faults.
    2. Replace PCB if needed.

air-conditioner - Helpful Tips

  • Keep the outdoor unit free from dust, insects, and moisture.
  • Do not operate the AC repeatedly with this error active.
  • Periodic AC servicing can prevent sensor damage.
  • Use genuine LG parts to avoid compatibility issues.
  • Consult a certified technician for internal sensor repairs.

Frequently Asked Questions❓

Question: What is a middle pipe thermistor used for?
Answer: It helps regulate and monitor refrigerant temperatures in the condenser to optimize performance.
Question: Can I fix CH45 myself?
Answer: If you’re experienced with AC systems, you can inspect and replace the sensor. Otherwise, hire a technician.
Question: Is CH45 dangerous to ignore?
Answer: It can lead to incorrect cooling behavior or system shutdown if left unresolved.

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