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Error code reference

Samsung Air Conditioner Error Code P413

Low pressure detection error at initial compressor start

Samsung codesSamsung air conditioner codes

Low pressure detection error at initial compressor start – low pressure below compressor down pressure before pump down start.

First step from the service manual

Measure pressure with manifold gauge at system stop; check low pressure sensor value via view mode or S-net.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What P413 means on a Samsung air conditioner

Error code P413 on a Samsung air conditioner indicates a low pressure detection fault occurring at the initial start of the compressor. Specifically, the system detects that the low-side refrigerant pressure has dropped below the compressor's minimum allowable operating pressure threshold before a pump-down cycle has even been initiated. This is a protective fault: the system monitors low pressure sensor readings at the moment compressor startup is commanded, and if the pressure reading falls below the established cutoff point, the unit halts operation to prevent compressor damage from running in a refrigerant-starved condition.

The low pressure sensor is the primary component involved in this fault. It reports suction-side pressure to the control board, and the board compares that value against the permissible operating range during initial start conditions. If the sensor signal is out of range or the actual refrigerant pressure is genuinely low, the error triggers. Technicians should begin diagnosis by connecting a manifold gauge set to measure actual system pressures at a complete stop, then cross-reference that reading against the low pressure sensor output using the view mode or S-net diagnostic interface to determine whether the fault is a true low-pressure condition or a sensor reporting error.

Common root causes include refrigerant loss from a leak, a failed or drifted low pressure sensor producing inaccurate readings, blocked filter driers or metering components restricting refrigerant flow, and in some cases a defective expansion valve causing abnormal pressure distribution at startup. Distinguishing between an actual low-charge condition and a sensor fault is the critical first step before any corrective action is taken.

Source: manufacturer service documentation.

Common causes of P413

  1. 01

    Refrigerant leak causing low system charge

    Part replacement

    A loss of refrigerant through a leak in the line set, coil, or fittings will cause suction-side pressure to drop below the minimum threshold at startup. Manifold gauge readings at system stop will confirm abnormally low static pressure, and UV dye or electronic leak detection can locate the source.

  2. 02

    Faulty or drifted low pressure sensor

    Part replacement

    The low pressure sensor may be reporting a pressure value that is lower than actual system pressure due to sensor failure or calibration drift. Comparing the manifold gauge reading against the sensor value in view mode or S-net will reveal a discrepancy if the sensor is at fault.

  3. 03

    Blocked or restricted filter drier

    Part replacement

    A saturated or clogged filter drier can restrict refrigerant flow enough to cause abnormally low suction pressure at startup. A noticeable temperature differential across the drier body or frost formation is a typical indicator of this restriction.

  4. 04

    Malfunctioning expansion valve

    Part replacement

    A stuck-closed or improperly operating electronic expansion valve can starve the low side of refrigerant, producing a low pressure reading at initial compressor start. Checking valve operation and refrigerant distribution across the system can help confirm this cause.

  5. 05

    Wiring or connector fault in the pressure sensor circuit

    Wiring / connection

    Loose, corroded, or damaged wiring between the low pressure sensor and the control board can produce an erroneous low-pressure signal that triggers P413 even when system pressure is within normal range. Inspecting the connector and wiring harness for continuity and secure seating is a low-cost first check.

See the test procedure for each cause

Frequently asked questions about P413

What does P413 mean on a Samsung air conditioner?
P413 is a low pressure detection error that occurs at the moment the compressor attempts to start. The system has measured the low-side refrigerant pressure and found it to be below the minimum allowable threshold before a pump-down cycle begins. The unit shuts down to protect the compressor from operating without adequate refrigerant. A technician should use a manifold gauge and the Samsung view mode or S-net interface to diagnose whether the fault is a real low-pressure condition or a sensor issue.
Can I fix a P413 error on my Samsung air conditioner myself?
Most causes of P413 require professional service. Refrigerant handling requires EPA Section 608 certification, and sensor or valve replacements require technical knowledge of the system's refrigerant circuit. A homeowner can check for obvious wiring issues at the pressure sensor connector, but diagnosing and correcting the underlying pressure fault should be left to a qualified technician.
Is it safe to keep using my Samsung air conditioner when P413 is displayed?
No. The P413 error is a protective fault designed to prevent the compressor from running under low-pressure conditions that could cause serious internal damage. Attempting to bypass or repeatedly reset the unit without addressing the root cause can result in compressor failure, which is a costly repair. The system should remain off until the cause is identified and corrected.
How much does it cost to repair a P413 error on a Samsung air conditioner?
Repair costs vary significantly depending on the cause. A sensor replacement typically falls in the range of $150 to $350 including labor. Refrigerant leak repair and recharge can range from $300 to $800 or more depending on the location and extent of the leak. A compressor replacement, if the unit was run in a damaged state, can exceed $1,000 to $2,500 depending on the system size and installation complexity.
Will resetting my Samsung air conditioner clear the P413 error?
A power reset may temporarily clear the P413 fault code, but if the underlying condition, such as low refrigerant charge or a failing sensor, has not been resolved, the error will return as soon as the system attempts to start the compressor again. Repeated resets without repair can expose the compressor to harmful operating conditions. A proper diagnosis using manifold gauges and the S-net or view mode diagnostic tools is required before the system should be returned to service.

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