LG Heat Pump Error Code CH06

CH06 indicates a problem detected in the refrigerant outlet side temperature sensor circuit. The control board is receiving a signal that falls outside acceptable parameters, either due to a faulty sensor, a wiring issue, or a poor connection at the PCB. The system triggers this code to prevent damage from unmonitored refrigerant temperatures. Diagnosis involves checking the connector, measuring sensor resistance at around 5k ohms unplugged, and checking for approximately 2.5 volts DC at the connector when plugged in.

It is not advisable to continue operating the unit while CH06 is active. The outlet side temperature sensor is a protective component, and running the system without reliable sensor feedback can allow refrigerant temperatures to reach levels that damage the compressor or other components. The unit may limit operation or shut down automatically for this reason.

Repair costs vary depending on what is faulty. A replacement outlet side thermistor sensor is generally an inexpensive part, with sensor costs typically ranging from around 15 to 60 dollars depending on the model. If the wiring harness or PCB requires replacement, costs rise considerably, potentially reaching several hundred dollars including labor. A diagnostic service call alone commonly runs between 75 and 150 dollars.

Some basic checks, such as reseating the sensor connector and inspecting the wiring harness for visible damage, can be performed by a knowledgeable DIYer. However, measuring resistance and voltage at the sensor and PCB requires a multimeter and familiarity with electronic diagnosis. Any work that involves handling refrigerant or accessing sealed system components must be performed by a certified technician.

A power reset may temporarily clear the code and allow the unit to restart, but if the underlying sensor or wiring fault still exists, CH06 will return. Resetting without repairing the root cause does not fix the problem and may mask a developing fault. A proper resistance and voltage test of the sensor circuit is needed to confirm the issue is resolved before relying on the unit.