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Error code reference

Samsung Air Conditioner Error Code E272

Low pressure sensor error

Samsung codesSamsung air conditioner codes

Low pressure sensor error – wire open or short.

First step from the service manual

Check sensor voltage: short error if <0.5V (or <0.4V), open error if >4.2V.

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

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What E272 means on a Samsung air conditioner

The E272 error code on a Samsung air conditioner indicates a low pressure sensor fault, specifically a wiring issue involving the low pressure sensor circuit. The low pressure sensor monitors refrigerant pressure on the suction side of the system, providing feedback to the control board to protect the compressor from operating under unsafe low-pressure conditions. When the control board detects a voltage reading outside the expected operating range, it flags E272 and halts normal operation to prevent potential compressor damage.

The diagnostic threshold is voltage-based. A reading below 0.5V (sometimes flagged at below 0.4V depending on firmware revision) indicates a short circuit condition in the sensor wiring or the sensor itself. A reading above 4.2V indicates an open circuit, meaning the signal wire has lost continuity somewhere between the sensor and the control board. Under normal operating conditions, the sensor output voltage should fall within a band between these two limits, reflecting actual refrigerant pressure.

Common causes include a damaged or pinched wiring harness at the sensor connector, corrosion at the connector terminals, a failed low pressure sensor, or an internal short within the sensor body. Physical damage to the wiring during installation or maintenance is a frequent culprit. In some cases, the control board input circuit for the pressure sensor signal may also be at fault if wiring checks out normal throughout the harness.

Source: manufacturer service documentation.

Common causes of E272

  1. 01

    Damaged or disconnected sensor wiring harness

    Wiring / connection

    The wiring between the low pressure sensor and the control board may be pinched, cut, or pulled loose at a connector. Inspect the full harness run for visible damage and check that the connector is fully seated.

  2. 02

    Corroded or contaminated connector terminals

    Wiring / connection

    Moisture intrusion into the sensor connector can cause oxidation on the terminals, increasing resistance or breaking continuity. Check terminal condition and clean or replace the connector if corrosion is present.

  3. 03

    Failed low pressure sensor

    Part replacement

    The sensor itself can fail internally, producing a voltage output below 0.5V or above 4.2V even when wiring is intact. If harness and connectors check out, measure sensor output voltage directly to confirm a faulty sensor.

  4. 04

    Short circuit in the sensor circuit

    Wiring / connection

    A short between the signal wire and ground anywhere in the harness will pull the sensor voltage below the 0.5V threshold. Use a multimeter to check for continuity between the signal wire and ground with the sensor disconnected.

  5. 05

    Faulty control board sensor input

    Part replacement

    If the wiring, connectors, and sensor all test within specification, the control board's input circuit for the low pressure sensor signal may have failed. This is the least common cause and typically requires board replacement.

See the test procedure for each cause

Frequently asked questions about E272

What does E272 mean on a Samsung air conditioner?
E272 indicates a low pressure sensor error caused by an open or short circuit in the sensor wiring. The control board detected a sensor voltage either below 0.5V, which signals a short, or above 4.2V, which signals an open circuit. The unit shuts down to protect the compressor from running under unknown or unsafe refrigerant pressure conditions.
Can I fix an E272 error myself?
Some causes of E272 are DIY-accessible, such as reseating a loose sensor connector, inspecting the wiring harness for visible damage, or cleaning corroded terminals. However, if the refrigerant system itself has a pressure problem or the sensor requires replacement with handling of refrigerant lines, a certified HVAC technician should perform the work. Always disconnect power before inspecting any wiring inside the unit.
Is it safe to run my Samsung air conditioner with an E272 error?
No. The E272 error causes the unit to shut down intentionally to protect the compressor. Running the system without a functioning low pressure sensor means the compressor could operate under dangerously low refrigerant pressure, which can cause compressor failure. Leave the unit off until the sensor fault is diagnosed and corrected.
How much does it cost to repair an E272 error on a Samsung air conditioner?
Repair costs depend on the root cause. A simple connector repair or harness fix might cost between $75 and $150 in labor if done by a technician. Replacing the low pressure sensor typically adds $30 to $80 in parts. If the control board needs replacement, total costs can range from $300 to $600 or more depending on the model and labor rates in your area.
Will resetting my Samsung air conditioner clear the E272 error?
A reset may temporarily clear the error code, but if the underlying wiring fault or sensor failure still exists, E272 will return as soon as the unit restarts and the control board checks the sensor signal again. A reset alone does not fix the problem. The sensor circuit must be inspected and the fault corrected before the unit will operate normally.

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