Samsung Air Conditioner Error Code E302

E302 indicates an outdoor ambient temperature sensor breakaway, meaning the control board has detected an open circuit in the outdoor temperature sensor circuit. This prevents the system from reading the outside temperature, which is necessary for proper operation of the refrigeration cycle. The fault points to a disconnected connector, broken wiring, or a failed sensor thermistor.

Operating the unit with E302 active is not recommended. Without a valid outdoor temperature reading, the control system cannot make accurate decisions about compressor operation, which can lead to inefficient performance or potential stress on system components. It is best to resolve the fault before resuming normal use.

A power reset may temporarily clear the E302 code, but it will return quickly if the underlying sensor circuit fault has not been resolved. The control board will re-detect the open circuit as soon as it runs its sensor checks after restart. A permanent resolution requires repairing or replacing the defective sensor, wiring, or connector.

A homeowner with basic electrical knowledge can safely inspect the outdoor unit for a visibly disconnected sensor connector and reseat it without specialized tools. However, testing sensor resistance with a multimeter and tracing wiring faults requires more comfort with electrical diagnostics. Any work involving the refrigerant system or control board replacement should be left to a certified technician.

If the fix is simply reseating a loose connector, there may be no parts cost, though a service call fee typically runs in the range of $75 to $150. Replacing the outdoor temperature sensor itself generally costs between $20 and $80 for the part, plus labor. If the outdoor control board is at fault, total repair costs can range from $200 to $500 or more depending on the model and labor rates.