Samsung Heat Pump Error Code E479

E479 indicates that the sump temperature sensor on the fixed-speed compressor has broken away from its mounted position on the compressor body. The sump sensor monitors the compressor oil temperature to protect the unit from damage. When the sensor separates from its mount, the control board can no longer get a valid temperature reading and shuts the system down. The fix involves locating the displaced sensor and securing it back in place.

No. The E479 fault is a protective shutdown, meaning the system will not operate normally while this code is active. Attempting to force the unit to run without a properly mounted sump sensor risks compressor damage from unmonitored sump temperatures. Address the sensor displacement before resuming normal operation.

If the sensor only needs to be reseated and secured, the repair cost is primarily the technician labor charge, which typically ranges from $75 to $200 depending on your location and service provider. If the sensor mounting hardware or the sensor itself requires replacement, parts costs are generally modest and the total repair may range from $100 to $350. More extensive repairs are unlikely unless there is additional underlying damage.

A knowledgeable technician or experienced DIYer can potentially resolve this by opening the unit, locating the fixed compressor sump sensor, and reseating it in its mounting clip or bracket. However, working inside a heat pump involves refrigerant components and high-voltage electrical systems, so professional service is recommended if you are not familiar with these systems. After reseating the sensor, the error will need to be cleared from the control board before the unit will restart.

A simple power reset may temporarily clear the code, but E479 will return if the sump sensor has not been physically reseated and secured to the compressor. The root cause is a hardware positioning issue, not a transient signal fault, so the sensor must be properly remounted before the fault will stay resolved.