Samsung Air Conditioner Error Code E417

E417 indicates a sump sub 2 sensor breakaway error, meaning the temperature sensor mounted on the sump of the second fixed compressor has been detected as separated from its mounting position. The control board relies on this sensor to monitor compressor temperature and protect the unit from damage. When the sensor is no longer properly seated, the system generates this fault code and may restrict or stop operation.

It is not recommended to continue operating the unit while the E417 error is active. The sump sensor monitors compressor temperature to prevent conditions like refrigerant flooding and lubrication problems. Running the compressor without reliable temperature monitoring increases the risk of compressor damage, which can result in significantly more costly repairs.

If the sensor has simply come loose and can be reattached without replacing any parts, the cost may be limited to a service call fee, typically in the range of $75 to $150 depending on your location. If the sensor or retaining hardware needs replacement, parts and labor costs could bring the total to a range of $150 to $350 or more. A control board issue, if that is the root cause, would increase costs further.

Start by having a technician inspect the fixed 2 compressor sump sensor to see if it has physically detached from the compressor. If the sensor has simply come loose, reattaching it firmly to the sump surface and confirming the wiring connector is fully seated will typically clear the error. If the retaining hardware or the sensor itself is damaged, those components will need to be replaced before the fault can be resolved.

A simple power reset will not permanently clear the E417 error if the underlying issue, a physically separated or failed sump sensor, has not been corrected. The fault will return as soon as the control board checks the sensor again. The sensor must be properly reattached or replaced before the error will stay cleared.