LG Air Conditioner Error Code 144

Error code 144 means the low pressure sensor in the sub1 outdoor unit detected an excessive drop in suction pressure, and the compressor was shut off as a protective measure. This fault protects the compressor from running under conditions that could cause mechanical damage. The cause can range from a closed service valve to a refrigerant leak or a sensor fault.

No, you should not attempt to bypass or continue running the unit while this fault is active. The compressor shutoff triggered by error 144 is a protective function designed to prevent serious compressor damage from insufficient lubrication and refrigerant flow. Continuing to force operation could result in compressor failure, which is a costly repair.

Repair costs vary widely depending on the root cause. If the fix is simply opening a closed service valve, the cost is limited to a service call fee, typically in the range of $75 to $150. If a refrigerant leak and recharge are required, costs can range from $200 to $600 or more depending on the refrigerant type and leak severity. A compressor replacement, if damage has already occurred, can range from $800 to $2,000 or higher.

Start by checking that both service valves on the sub1 outdoor unit are fully open, as a closed valve is the most common and simplest cause. If the valves are open, a qualified technician should connect manifold gauges to check actual suction pressure, inspect for refrigerant leaks, and test the low pressure sensor. Repairs may involve recharging refrigerant, replacing a faulty sensor, or clearing a restriction in the refrigerant circuit.

A reset may temporarily clear the fault display, but the error will return as soon as the compressor restarts if the underlying cause has not been corrected. The low pressure condition that triggered the fault must be diagnosed and repaired before the system will operate normally. Repeated resets without repair can increase the risk of compressor damage.