Samsung Air Conditioner Error Code E443

E443 indicates that the high-side refrigerant pressure was detected below the expected threshold before the cooling cycle could restart, causing the unit to lock out. The fault points to either a high pressure sensor problem or an actual loss of refrigerant due to a leak. The system prevents compressor operation under these conditions to avoid mechanical damage.

No. The unit has locked out for a reason, and continuing to force restarts without resolving the underlying issue can cause serious compressor damage. If the cause is a refrigerant leak, low charge conditions create conditions that can burn out the compressor motor. The system should remain off until the fault is properly diagnosed and repaired.

A power reset may temporarily clear the fault code, but if the underlying cause, such as a refrigerant leak or failed sensor, is still present, the error will return as soon as the system attempts to restart the cooling cycle. Resetting without diagnosis and repair does not resolve the issue and can delay a repair while the refrigerant charge continues to drop or component damage progresses.

The initial wiring check, verifying the high pressure sensor connector is properly seated at the PCB, is a task a knowledgeable DIYer can perform safely. However, if the fault is caused by refrigerant leakage, repair and recharge work involves handling regulated refrigerants and requires a certified HVAC technician. Attempting refrigerant work without proper equipment and certification is unsafe and illegal in most regions.

Repair costs vary significantly depending on the root cause. Replacing a high pressure sensor typically costs in the range of $75 to $200 including parts and labor. If a refrigerant leak is involved, costs rise considerably due to leak detection, repair of the breach, and refrigerant recharge, which can range from $200 to $600 or more depending on system size and the location of the leak.