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Error code reference

Samsung Air Conditioner Error Code E230

Compressor OLP sensor error (short/open)

Samsung codesSamsung air conditioner codes

Compressor OLP sensor error (short/open) - error condition: outdoor temperature under -20°C; error level: over 4.95V (-30°C) or under 0.5V (151°C).

First step from the service manual

Turn off the system and replace the sensor.

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

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What E230 means on a Samsung air conditioner

The E230 error code on a Samsung air conditioner indicates a fault with the compressor Overload Protector (OLP) sensor, which monitors the temperature of the compressor to prevent damage from overheating or extreme cold. The error is triggered when the signal voltage from this sensor falls outside the acceptable operating range: a reading above 4.95V corresponds to a temperature below -30°C, while a reading below 0.5V corresponds to a temperature above 151°C. Either condition causes the system to flag the sensor as failed, either shorted or open circuit, and shut down to protect the compressor.

This fault is specifically associated with outdoor ambient temperatures dropping below -20°C, which can affect sensor resistance and circuit behavior. The OLP sensor is a thermistor-type component whose resistance changes predictably with temperature. When the circuit reads a voltage at either extreme boundary, it indicates the sensor element has lost continuity (open circuit) or has an internal short, rather than reflecting an actual temperature within the measurable range.

The most direct resolution is sensor replacement after powering down the unit. Before replacing the component, technicians should inspect the sensor wiring harness for visible damage, corrosion at connector pins, or chafed insulation that could cause an artificial open or short reading. Confirm the outdoor temperature is within normal operating range during diagnosis, as genuine extreme cold can produce borderline voltage readings that mimic a sensor fault.

Source: manufacturer service documentation.

Common causes of E230

  1. 01

    Failed OLP sensor (open or short circuit)

    Part replacement

    The thermistor element inside the OLP sensor has degraded or failed outright, causing the circuit voltage to spike above 4.95V or drop below 0.5V. This is the most common cause and is confirmed by measuring the sensor's resistance, which will be out of the expected range or unmeasurable.

  2. 02

    Damaged or corroded sensor wiring harness

    Wiring / connection

    Exposed or corroded wires in the harness connecting the OLP sensor to the control board can create a false open or short circuit reading. Inspect the full length of the harness and all connector pins for oxidation, breaks, or chafed insulation.

  3. 03

    Loose or disconnected sensor connector

    Wiring / connection

    A connector that has vibrated loose or was not fully seated at the control board or sensor end will interrupt the circuit and trigger an open-circuit fault. Check that all connectors in the OLP sensor circuit are firmly seated and locked.

  4. 04

    Outdoor ambient temperature below -20°C

    Wiring / connection

    Genuine extreme cold at or below -20°C outdoors can push sensor voltage readings toward the fault threshold, triggering E230 even without a failed sensor. This should be ruled out by verifying current outdoor conditions before condemning the sensor.

  5. 05

    Faulty outdoor control board

    Part replacement

    If the sensor and all wiring check out correctly but the error persists, the outdoor PCB may not be interpreting the sensor signal accurately. Board-level faults are less common but should be considered after ruling out sensor and wiring issues.

See the test procedure for each cause

Frequently asked questions about E230

What does E230 mean on a Samsung air conditioner?
E230 indicates a compressor OLP (Overload Protector) sensor error caused by a short or open circuit in the sensor. The system detects this fault when the sensor voltage goes above 4.95V (corresponding to below -30°C) or below 0.5V (corresponding to above 151°C). This typically happens because the sensor has failed, the wiring is damaged, or the outdoor temperature has dropped below -20°C. The unit shuts down to protect the compressor until the fault is resolved.
Can I fix E230 myself, or do I need a technician?
Inspecting the wiring harness and connector for obvious damage or loose connections is something a knowledgeable DIYer can attempt after powering the system off completely. However, replacing the OLP sensor requires working inside the outdoor unit and handling refrigerant-side components, which typically requires a certified HVAC technician. It is safest to have a professional handle the repair unless you have specific experience with air conditioner servicing.
Is it safe to keep running my air conditioner with an E230 error?
No, you should not attempt to bypass or ignore E230. The OLP sensor exists to protect the compressor from temperature extremes, and operating the system without a functioning sensor removes that protection. Continued operation could result in compressor damage, which is a significantly more expensive repair. Turn the system off until the sensor is inspected and replaced if necessary.
How much does it cost to fix an E230 error on a Samsung air conditioner?
If only the OLP sensor needs replacement, parts and labor typically range from around $75 to $200 depending on the unit model and local labor rates. If the outdoor control board is also found to be faulty, costs can rise to a range of $200 to $500 or more. Getting a diagnostic visit from a technician first will help identify exactly which components need to be replaced.
Will resetting my Samsung air conditioner clear the E230 error?
A power reset may temporarily clear the E230 error code, but the fault will return if the underlying cause has not been addressed. If the OLP sensor is shorted or open, the system will detect the fault again as soon as it runs a check on startup. A reset alone is not a repair and should only be used as a temporary step while arranging proper diagnosis and service.

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