LG air conditioner CH01 code: indoor temperature sensor fault (mini-split)

On LG mini-splits, CH01 means a temperature sensor in the indoor unit is giving a bad reading, usually the room air sensor. LG groups it with sensor faults caused by a failed or loose sensor, a board error or a brief power problem.

Likely causes

Listed from most to least common.

1. Indoor temperature sensor (thermistor) failed
2. Sensor plug loose or disconnected from the board
3. Indoor control board fault
4. Temporary electrical glitch

How to fix the CH01 code

Unplug the air conditioner or switch it off at the breaker before removing any panel or filter.

1. 1

   Step 1: Reset the power

   Switch off the unit's breaker, or unplug it, and wait about 5 minutes. Turn it back on and check if the code has cleared.

2. 2

   Step 2: Keep using it if it clears

   If the unit runs normally after the reset, a brief power glitch was likely the cause. Keep an eye on it.

3. 3

   Step 3: Stop if it returns

   If CH01 comes back, turn the unit off and book a repair. LG advises against opening the unit yourself.

When to call a technician

If CH01 returns after a reset, a technician needs to check the sensor and its connection to the indoor board.

A typical repair for this code costs $150–$400 in the US, including parts and labor. Prices vary by area and model.

Models this applies to

• Ductless mini-splits (wall-mounted and Art Cool)
• Multi-zone mini-split systems
• Window air conditioners
• Portable air conditioners

Codes can differ slightly between models. Your owner's manual is the final word and is available from LG support.

Common questions