Samsung Air Conditioner Error Code P702

P702 indicates two related faults occurring together: an outdoor unit protection control event at a low-level risk level, and an indoor unit electronic expansion valve (EEV) opening error. The EEV regulates refrigerant flow into the indoor coil, and when it fails to open correctly, the outdoor unit protection system responds to the resulting abnormal operating conditions. Both sides of the fault need to be diagnosed to resolve the code.

It is not advisable to continue operating the unit with P702 active. The outdoor unit protection control has engaged because operating conditions are outside normal parameters. Continuing to run the system under these conditions risks damaging the compressor or other refrigerant circuit components, which would result in significantly higher repair costs.

A power reset may temporarily clear the code and allow the unit to restart, but if the underlying EEV or wiring fault has not been corrected, the P702 error will return, often quickly. Resetting without repair is not a solution and can mask a developing problem that causes additional component damage over time. The root cause should be diagnosed and repaired before relying on the unit for normal operation.

Some basic checks, such as inspecting the EEV wiring harness for loose or corroded connectors, can be performed without specialized tools. However, testing the EEV coil resistance, diagnosing the indoor PCB output, and checking refrigerant pressures require electrical meters and refrigerant gauges. If the EEV or PCB needs replacement, a qualified HVAC technician should perform the work, especially any repair involving the refrigerant circuit.

Repair costs depend on which component is at fault. An EEV coil replacement is typically in the range of $150 to $350 including parts and labor. If the indoor control board requires replacement, costs can range from $250 to $600 or more. If a refrigerant leak is involved, adding refrigerant and repairing the leak can add $200 to $500 to the total. A diagnostic visit is usually needed first to identify the specific failed component.