What it means
LG Canada's chart says 'Indoor unit inlet pipe thermistor has disconnected or has shorted out.' LG's US room air conditioner page pairs CH02 with E1 and calls it an auto-stop protection.
What to check, in order
- Reset the power
Unplug the unit or switch off its breaker and wait before switching it back on. LG's general guide says about 5 minutes. Its page for portable and window units says 2 minutes is enough for the power to discharge.
- Stop using it if it returns
If CH02 comes back after a reset, LG says to stop using the unit and request service.
When to call an engineer
LG lists a faulty or loose pipe sensor, a main circuit board error or a temporary electrical problem as possible causes. A technician needs to check the sensor and its wiring.
A repair visit will usually check the sensor's reading and its wiring.
- Note the model and serial number. They're on a label on the side of the indoor unit, and on the outdoor unit.
- Write down the exact code, and what the appliance was doing when it appeared.
- Check whether it's still under warranty. If it is, the repair may cost you nothing.
Quick answers
What does the LG CH02 error code mean?
The temperature sensor on the indoor unit's coil pipe has disconnected or shorted out, so the unit has stopped to protect itself. LG Canada's chart says 'Indoor unit inlet pipe thermistor has disconnected or has shorted out.' LG's US room air conditioner page pairs CH02 with E1 and calls it an auto-stop protection.
Can I fix LG CH02 myself?
Engineer only (engineer visit). Start with: reset the power; stop using it if it returns. LG lists a faulty or loose pipe sensor, a main circuit board error or a temporary electrical problem as possible causes. A technician needs to check the sensor and its wiring.
Is LG CH02 worth repairing?
Worth fixing. Usually a sensor or its connection, which is a fairly small repair for a technician.
Checked against
- LG Canada: Single / Multi-Split Air Conditioner Error Codes
- LG USA: How to troubleshoot error codes CH01, CH02, CH06, CH12, CH41 to CH48, E1, E2, E3, E7, E8, F2, F3, CH21, CH23, CH26, CH29 and E9
- LG USA: Room air conditioner (portable, window, through-the-wall) error codes
Last reviewed October 2026. Manufacturers update their pages, and your manual is the final word. Spotted a mistake? Email contact@appliance-error-codes.com.