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lg | air-conditioner – Suction Pipe Thermistor Fault
Error Codes (undefined): Troubleshooting, Fixes & Prevention Tips explained below.

What Does CH46 Mean?❓

CH46 indicates that the suction pipe thermistor is not functioning correctly. This sensor helps the system regulate cooling cycles by monitoring return refrigerant temperatures. If readings are too high, too low, or absent, the system flags CH46 and may stop operating to prevent further issues.

air-conditioner - Causes of CH46 Error

  • Disconnection or loose wire at the thermistor
  • Sensor damaged by heat or vibration
  • Short circuit or broken wire in sensor line
  • Faulty thermistor reading incorrect temperatures
  • Main PCB not receiving or interpreting data correctly

air-conditioner - How to Fix CH46 Error❓

  • Turn Off the AC and Inspect Wiring

    1. Ensure the suction pipe thermistor is securely connected.
    2. Check wires for cuts, burns, or corrosion.

  • Test Thermistor Function

    1. Use a multimeter to check the sensor’s resistance.
    2. Compare the reading to LG’s standard values.

  • Replace Faulty Sensor

    1. If the thermistor is malfunctioning, replace it with a compatible LG sensor.
    2. Secure wiring and check for other loose connections.

  • Test System After Repair

    1. Restore power and monitor the unit.
    2. Confirm CH46 error does not reappear.

air-conditioner - Helpful Tips

  • Keep sensors and wiring clean and dry.
  • Never ignore thermistor-related faults as they protect the compressor.
  • Use only genuine LG parts for replacement.
  • Schedule routine maintenance to catch sensor faults early.
  • Turn off the AC at the circuit breaker before any inspection.

Frequently Asked Questions❓

Question: Is CH46 a serious fault?
Answer: Yes. If the suction pipe sensor fails, it can cause cooling issues or compressor damage if ignored.
Question: Where is the suction pipe thermistor located?
Answer: It’s mounted on the pipe where refrigerant returns to the compressor in the outdoor unit.
Question: Can I bypass the CH46 error temporarily?
Answer: Bypassing is not recommended. It compromises compressor safety. Replace the sensor instead.

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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Suction Pipe Thermistor Fault - lg | air-conditioner Error Repair | Appliance Error Code Fix