LG Air Conditioner Error Code 29

Error code 29 indicates that the outdoor unit inverter compressor has exceeded its maximum allowable input current of 46 amps. The system shuts down automatically to protect the compressor and inverter components from damage. This fault points to a condition in the refrigerant circuit or compressor itself that is causing abnormally high electrical load. A technician will need to inspect refrigerant pressures, the expansion valve, line routing, and compressor condition.

No. Error code 29 is a protective shutdown triggered by overcurrent conditions that could damage the compressor or inverter board if the unit continued running. The system locks out specifically to prevent this damage. Attempting to force the unit back on repeatedly without resolving the cause risks burning out the compressor, which is a significantly more expensive repair.

Repair cost depends heavily on the root cause. A refrigerant adjustment or line correction might run between $150 and $400 including labor. An EEV replacement typically falls in the $200 to $600 range depending on parts and labor rates. A compressor replacement is the most expensive outcome, generally ranging from $800 to $2,000 or more depending on the system size and refrigerant type.

Some preliminary checks are within reach of a capable DIYer, such as confirming the outdoor unit is not blocked or covered and verifying the EEV wiring connector is fully seated and free of corrosion. However, checking refrigerant pressures requires certified equipment and EPA 608 certification to handle refrigerants legally. If the pressure system or compressor is at fault, a licensed HVAC technician should complete the repair.

A power reset may temporarily clear the fault and allow the unit to restart, but if the underlying cause is not corrected, the error code will return, typically within the same operating cycle. Repeated resets without diagnosis can accelerate wear on the compressor and inverter components. The fault should be properly diagnosed and repaired before relying on the unit for regular operation.