Samsung Air Conditioner Error Code P422

P422 is a freezing protection code that activates when the indoor heat exchanger temperature falls below -4°C for more than 5 consecutive minutes during cooling operation. The unit shuts down automatically to prevent the evaporator coil from freezing solid, which could damage internal components and the compressor. The most common trigger is restricted airflow caused by a dirty filter or blocked air inlet.

No, you should not attempt to override or ignore the P422 shutdown. A frozen evaporator coil blocks virtually all airflow and can allow liquid refrigerant to return to the compressor, which can cause serious and expensive compressor damage. Allow the unit to remain off until the coil is fully thawed, then address the underlying cause before restarting.

If the cause is simply a dirty filter or blocked inlet, there is no parts cost and the repair is a DIY task. Professional coil cleaning typically runs in the range of $75 to $200 depending on the service provider and unit accessibility. If a blower motor replacement is needed, expect parts and labor costs in the range of $150 to $400. Refrigerant-related repairs involving diagnosis, leak repair, and recharge can range from $200 to $600 or more depending on the extent of the problem.

Start by turning the unit off and removing any obstacles from the air inlet on the front of the indoor unit. Remove the dust filter, clean it thoroughly under running water, and allow it to dry completely before reinstalling. If the coil is visibly iced over, leave the unit off until the ice melts naturally before restarting. If the error returns after these steps, the evaporator coil itself may need cleaning or a technician may need to inspect the blower motor and refrigerant circuit.

A power reset may temporarily clear the fault display, but the code will return quickly if the underlying condition has not been corrected. The control board will trigger P422 again as soon as the heat exchanger temperature drops below -4°C for 5 minutes under the same operating conditions. Always resolve the airflow restriction or system fault before resetting.