Samsung Air Conditioner Error Code E122

E122 means the control board has detected an open or short circuit in the indoor heat exchanger evaporator inlet temperature sensor. The fault can result from a disconnected connector, a broken wire, or a failed sensor. The unit stops normal operation when this code appears to prevent damage to the refrigeration system.

No, the unit should not be operated while the E122 code is active. Without a valid reading from the EVAP IN sensor, the control board cannot properly regulate the refrigeration cycle, which can lead to coil icing, compressor overload, or reduced equipment life. Resolve the fault before resuming normal use.

A power reset may temporarily clear the displayed code, but E122 will return as soon as the control board re-evaluates the sensor circuit and detects the same open or short condition. The underlying wiring or sensor fault must be corrected for the error to clear permanently. Repeatedly resetting the unit without addressing the root cause does not resolve the problem.

Checking and reseating the sensor connector is a straightforward task that a confident DIYer can perform after unplugging the unit. If the connector is secure, testing the wire for continuity and measuring the sensor resistance requires a multimeter and basic electrical knowledge. Replacing the sensor itself is also manageable for someone comfortable working inside an indoor air handler, but if you are unsure, a qualified technician should handle the diagnosis and repair.

If the fix is simply reseating a loose connector, there is no parts cost and only a service call fee if a technician performs the work, typically in the range of $75 to $150. Replacing the EVAP IN temperature sensor usually costs between $20 and $60 for the part, with total repair costs including labor ranging from $100 to $250 depending on your location and the technician's rates.