LG HVAC Error Code CH01

CH01 on an LG HVAC system means the indoor thermistor has an open or short circuit condition. The thermistor is the temperature sensor inside the indoor unit that the control board uses to regulate system operation. Because the sensor is producing an invalid reading, the system shuts down automatically. The fault must be resolved before the unit will resume normal operation.

No. When CH01 is active, the LG system turns off operation automatically because it cannot reliably monitor indoor temperatures. Attempting to bypass this safety shutoff and run the system without a functioning thermistor could result in uncontrolled operation and potential damage to system components. The fault should be diagnosed and corrected before resuming use.

Repair costs depend on the root cause. If a loose connector is the issue, a service call to diagnose and reseat the connection typically runs in the range of $75 to $150 for labor. If the thermistor itself needs replacement, parts can add $20 to $80 depending on the model, plus labor. A damaged wiring harness or control board failure would increase costs further, potentially ranging from $150 to $400 or more including parts and labor.

A homeowner with basic comfort can check whether the thermistor wiring connector has become loose and reseat it, which sometimes clears the error. However, testing the thermistor resistance and inspecting internal wiring requires opening the unit and using a multimeter, which is better suited to an experienced DIYer or technician. If the thermistor itself has failed, replacing it requires identifying the correct part for your specific model.

A power reset may temporarily clear the CH01 code if the fault was caused by a momentary connector interruption, but if the thermistor or wiring is genuinely faulty, the error will return once the system restarts and re-checks the sensor. Resetting without repairing the underlying cause is not a reliable fix. The connector and thermistor should be inspected regardless of whether a reset appears to work.