LG Air Conditioner Error Code 36

Error code 36 on an LG air conditioner means the outdoor unit has detected a low compression ratio and has entered a protective operational limit. The compression ratio is the relationship between high-side and low-side refrigerant pressures. When this ratio is too low, the system restricts operation to prevent compressor damage. Common causes include low refrigerant charge, a failing compressor, or extreme outdoor temperatures.

It is not advisable to continue running the unit while error code 36 is active. The system has already limited operation to protect the compressor, and forcing continued use under a low compression ratio condition can accelerate internal compressor wear or cause irreversible damage. Turn the unit off and contact a technician for diagnosis before resuming normal operation.

Repair costs vary significantly depending on the cause. Refrigerant recharge services typically range from $150 to $400 depending on refrigerant type and the amount needed. Compressor replacement is a more involved repair and can range from $600 to $1,500 or more including labor. A diagnostic service call to identify the cause usually costs between $75 and $150.

Most of the root causes behind error code 36 require professional tools and certifications to address properly. Checking and recharging refrigerant legally requires an EPA Section 608 certification. You can check that the outdoor unit is not obstructed and that the ambient temperature is within the unit's operating range, but internal repairs should be handled by a licensed HVAC technician.

A power reset may temporarily clear the error code, but if the underlying cause such as low refrigerant or a failing compressor is still present, the code will return once the system restarts and the condition is detected again. Resetting without addressing the root cause does not resolve the problem and may delay a proper diagnosis.