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Error code reference

Samsung Air Conditioner Error Code E417

Sump Sub 2 sensor breakaway error.

Samsung codesSamsung air conditioner codes

Sump Sub 2 sensor breakaway error.

First step from the service manual

Check if fixed 2 compressor sump sensor is separated; reassemble.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E417 means on a Samsung air conditioner

Error code E417 on a Samsung air conditioner indicates a sump sub 2 sensor breakaway error, specifically related to the temperature sensor mounted on the sump of the fixed 2 (second fixed-speed) compressor. This sensor monitors the compressor sump temperature to protect the unit from operating under conditions that could cause refrigerant slugging or lubrication failure. When the control board detects that this sensor has become physically separated from its mounting point, it generates the E417 fault and may shut down or limit operation to prevent equipment damage.

The most direct cause of this error is the sump sensor physically detaching from the compressor body. This can happen due to vibration over time, improper installation, or a failure of the sensor clip or adhesive that holds it in contact with the sump surface. Because the sensor is no longer in proper thermal contact with the compressor, readings become erratic or fall outside the expected range, triggering the fault condition.

Diagnosing E417 begins with a physical inspection of the fixed 2 compressor sump sensor. Technicians should check whether the sensor has pulled free of its mounting bracket or clip and whether the wiring harness connector is still fully seated. If the sensor is simply dislodged, reattaching it securely to the sump and ensuring firm thermal contact will typically resolve the fault. If the sensor or its retaining hardware is damaged, replacement of the component will be necessary before the error can be cleared.

Source: manufacturer service documentation.

Common causes of E417

  1. 01

    Sensor physically dislodged from compressor sump

    Wiring / connection

    The most common cause is the sump sensor clip or mounting hardware loosening due to vibration, causing the sensor to separate from the compressor body. A visual inspection of the fixed 2 compressor sump will confirm if the sensor is hanging free or off-position.

  2. 02

    Damaged sensor retaining clip or bracket

    Part replacement

    The clip or bracket that holds the sensor against the compressor sump may be cracked or deformed, preventing proper reassembly. If the retaining hardware cannot hold the sensor securely after reattachment, the bracket or clip will need to be replaced.

  3. 03

    Loose or disconnected wiring harness connector

    Wiring / connection

    The connector joining the sump sensor to the wiring harness may have vibrated loose, causing an open circuit that the control board interprets as a sensor separation error. Check that the connector is fully seated and latched.

  4. 04

    Faulty sump temperature sensor

    Part replacement

    If the sensor itself has failed internally, it may produce readings that fall outside the acceptable range even when physically mounted correctly. This would require sensor replacement to resolve the fault.

  5. 05

    Control board misreading sensor signal

    Part replacement

    In rare cases, a fault in the control board input circuit may cause a false E417 reading even when the sensor is properly seated. This should only be considered after the sensor and wiring have been confirmed to be in good condition.

See the test procedure for each cause

Frequently asked questions about E417

What does E417 mean on a Samsung air conditioner?
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.
How do I fix the E417 error on my Samsung air conditioner?
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.
Is it safe to keep running my air conditioner with an E417 error?
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.
Will resetting my Samsung air conditioner clear the E417 error?
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.
How much does it cost to repair an E417 error on a Samsung air conditioner?
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.

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