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Error code reference

Samsung Air Conditioner Error Code 413

Protection control by SUMP sensor

Samsung codesSamsung air conditioner codes

Protection control by SUMP sensor - compressor refrigerants inflow protection.

First step from the service manual

Check if SUMP sensor is mounted in right position and sensor connector; check for compressor refrigerants inflow.

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

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What 413 means on a Samsung air conditioner

Samsung air conditioner error code 413 indicates that the unit has entered protection control mode due to an abnormal reading from the SUMP sensor. The SUMP sensor monitors conditions at the bottom of the compressor, specifically to detect the presence of liquid refrigerant migrating into the compressor body. When liquid refrigerant collects in the compressor sump rather than being fully vaporized, it can cause serious mechanical damage during startup, a condition known as liquid slugging. The control board activates this protection routine to prevent the compressor from operating under dangerous conditions.

The most common trigger for this fault is refrigerant inflow to the compressor, which occurs when refrigerant migrates from the system back into the compressor during off cycles, particularly in cold ambient temperatures or after extended shutdowns. This migration causes the liquid level in the sump to rise, which the SUMP sensor detects. Beyond refrigerant behavior, a physically mispositioned SUMP sensor or a faulty sensor connector can also produce a false 413 fault, since the control board relies entirely on that sensor's signal to determine whether protection is needed.

Diagnosis should begin by confirming the SUMP sensor is correctly mounted in its designated position on the compressor body and that the sensor connector is fully seated and free of corrosion or damage. If the sensor and wiring check out, the next step is to assess whether refrigerant inflow is actually occurring, which may involve checking system pressures, inspecting for refrigerant overcharge, and evaluating operating conditions that could promote liquid migration.

Source: manufacturer service documentation.

Common causes of 413

  1. 01

    Refrigerant inflow to compressor sump

    Wiring / connection

    Liquid refrigerant migrating into the compressor during off cycles is the primary cause of this protection event. This is more likely after long shutdowns, in cold ambient conditions, or when the system is overcharged with refrigerant.

  2. 02

    SUMP sensor incorrectly mounted

    Wiring / connection

    If the SUMP sensor has shifted from its correct mounting position on the compressor, it may produce inaccurate readings that trigger a false 413 fault. Visually inspect the sensor's placement and reseat or reattach it if necessary.

  3. 03

    Loose or damaged SUMP sensor connector

    Wiring / connection

    A connector that is partially unseated, corroded, or damaged can cause signal interruptions that the control board interprets as a protection condition. Inspect the connector for physical damage, corrosion, and secure fit.

  4. 04

    Faulty SUMP sensor

    Part replacement

    If the sensor's electrical characteristics are out of specification due to internal failure, it will send incorrect data to the control board even when correctly mounted and connected. Testing the sensor's resistance output can help confirm this.

  5. 05

    Refrigerant overcharge

    Wiring / connection

    An overcharged refrigerant system increases the likelihood of liquid refrigerant reaching the compressor sump. System pressures should be measured and compared to specified values to rule out overcharge as a contributing factor.

See the test procedure for each cause

Frequently asked questions about 413

What does 413 mean on a Samsung air_conditioner?
Error code 413 on a Samsung air conditioner indicates that the unit has entered protection mode based on a reading from the SUMP sensor, which monitors the compressor for liquid refrigerant inflow. The system shuts down to prevent liquid slugging damage to the compressor. The fault points to either an actual refrigerant inflow condition or a problem with the SUMP sensor itself, including its mounting position or connector.
Can I fix error code 413 on my Samsung air conditioner myself?
Some aspects of diagnosing a 413 error are accessible to a knowledgeable DIYer, such as checking whether the SUMP sensor connector is securely attached and inspecting the sensor's mounting position on the compressor. However, any work involving refrigerant pressures, refrigerant charge levels, or compressor component replacement requires a certified HVAC technician. Attempting to handle refrigerants without proper certification and equipment is both illegal and unsafe.
Is it safe to keep running my air conditioner with error code 413?
No. The 413 protection control is designed specifically to prevent the compressor from operating under conditions that could cause severe internal damage from liquid refrigerant. Running the unit while this error is active risks compressor failure, which is one of the most costly repairs possible on an air conditioning system. The unit should remain off until the underlying cause is diagnosed and resolved.
Will resetting my Samsung air conditioner clear error code 413?
A power reset may temporarily clear the displayed error, but if the underlying condition, whether a refrigerant inflow problem or a faulty sensor, has not been corrected, the error will return once the unit attempts to operate again. Resetting without diagnosis does not address the root cause and can delay necessary repairs.
How much does it cost to repair a Samsung air conditioner showing error code 413?
Repair costs vary significantly depending on the root cause. If the issue is simply a mispositioned or disconnected SUMP sensor, costs may be limited to a service call fee, typically in the range of $75 to $150. A faulty sensor requiring replacement may add $50 to $200 in parts and labor. If refrigerant overcharge or inflow issues are found, adding refrigerant adjustment or further diagnostic work can bring total costs to $150 to $400 or more. Compressor replacement, if damage has already occurred, is substantially more expensive.

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