LG Air Conditioner Error Code 169

Error code 169 indicates an excessive rise in high-side refrigerant pressure in the sub3 outdoor unit, causing the system to shut off the compressor as a protective measure. The high pressure sensor detected pressure beyond the safe operating threshold and triggered the lockout. This fault requires diagnosis of the refrigerant circuit, airflow, and mechanical components before the unit can safely resume operation.

No, you should not attempt to override or continuously reset the system while error 169 is active. The system has shut the compressor off specifically to prevent damage from excessive pressure, and forcing it to run could result in compressor failure or refrigerant line rupture. Allow the unit to remain off and address the underlying cause before restarting.

Repair costs vary widely depending on the cause. Cleaning a blocked condenser coil or opening a service valve may cost relatively little in labor, typically in the range of $75 to $200. If the condenser fan motor or high pressure sensor needs replacement, parts and labor combined can range from $150 to $600 or more. Refrigerant-related repairs involving recovery and recharge will also add to the total and require a certified technician.

Start by confirming that the service valve on the sub3 outdoor unit is fully open, as a closed valve is the most common and easiest-to-fix cause of this fault. Next, inspect the outdoor condenser coil for dirt or debris blockages and check that the condenser fan is spinning freely. If those checks pass, a licensed HVAC technician should measure system refrigerant pressures with gauges and inspect the high pressure sensor to identify the root cause.

A power reset may temporarily clear the fault and allow the system to attempt a restart, but the error will return if the root cause has not been corrected. The high pressure condition that triggered the fault must be resolved first. Repeated resets without fixing the underlying issue increase the risk of permanent compressor damage.