Samsung Heat Pump Error Code E602

E602 indicates an indoor unit Electronic Expansion Valve (EEV) close error, meaning the valve has not opened as commanded during the first detection event. The EEV controls refrigerant flow into the indoor coil, and when it fails to move to the open position, the system faults to prevent damage. This error typically points to a wiring issue at the PCB connection or a problem with the EEV coil or valve body itself.

No, you should not continue operating the unit while E602 is active. The error indicates the refrigerant metering valve is not functioning correctly, which means the system cannot regulate refrigerant flow properly. Running the heat pump in this condition risks compressor damage and can cause additional component failures.

A power reset may temporarily clear the E602 fault code, but it will return if the underlying problem with the EEV or its wiring has not been corrected. Because E602 is flagged as a first-detection event, the system will log subsequent occurrences if the condition persists. A reset should only be used after a repair has been completed, to confirm the fault does not reappear during normal operation.

The first step you can safely perform yourself is checking that the EEV wiring harness is securely connected to the indoor unit PCB, as a loose connector is a common cause of this fault. Beyond that, diagnosing and replacing the EEV coil, valve body, or PCB involves working with refrigerant-side components and control board circuitry, which is best handled by a qualified technician. Attempting repairs without the proper tools and training can result in refrigerant leaks or further damage to the system.

Repair costs vary depending on the root cause. If only the wiring harness needs repair or replacement, costs are generally in the lower range, typically between $75 and $200 for parts and labor. An EEV coil or valve body replacement will typically run between $150 and $450 depending on the model and labor rates in your area. A PCB replacement represents the higher end of the cost range, potentially between $300 and $700 or more.