Samsung Air Conditioner Error Code 443

Error code 443 on a Samsung air conditioner means the system detected that the high-side refrigerant pressure was below the expected average before attempting to restart the cooling cycle. The unit locks out the compressor as a protective measure. The two most likely causes are a failed high pressure sensor or a refrigerant leak in the system.

A power reset may temporarily clear the fault display, but the error will return if the underlying cause, either a low refrigerant charge or a failing pressure sensor, has not been corrected. Repeated resets without repair can allow the unit to attempt restarts under abnormal conditions, which risks compressor damage over time.

Repair costs depend on the root cause. Replacing a faulty high pressure sensor typically ranges from around 100 to 250 dollars including labor. If the system has a refrigerant leak, costs can range from 200 to 600 dollars or more depending on the leak location, the amount of refrigerant needed, and whether any damaged components require replacement.

Some basic checks, such as verifying that service valves are fully open and inspecting the sensor wiring for loose connections, can be done without special tools. However, diagnosing refrigerant leaks and handling refrigerant requires certified equipment and EPA 608 certification in the United States. Replacing the high pressure sensor also requires proper recovery and recharge procedures if refrigerant lines must be opened.

The unit is designed to prevent operation when this code is active, which is a built-in safety measure. You should not attempt to override the lockout or force a restart repeatedly. If the cause is a refrigerant leak, continued attempted operation can damage the compressor and may release refrigerant into the environment.