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Error code reference

Samsung Air Conditioner Error Code t8

Low pressure sensor OPEN/SHORT error

Samsung codesSamsung air conditioner codes

Low pressure sensor OPEN/SHORT error. Detected when compressor is on. SHORT error below 0.4V, OPEN error over 4.7V.

First step from the service manual

Check sensor wiring and connector; replace sensor or PCB if defective.

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

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What t8 means on a Samsung air conditioner

The Samsung air conditioner T8 error code indicates a fault with the low pressure sensor, specifically an OPEN or SHORT circuit condition detected in the sensor signal circuit. This sensor monitors refrigerant pressure on the low side of the refrigeration loop and is a critical input for compressor protection. The T8 fault is only triggered when the compressor is actively running, meaning the control board expects a valid sensor signal within a defined voltage window during operation.

The control board reads the sensor as a SHORT when the signal voltage drops below 0.4V, and as an OPEN when the voltage rises above 4.7V. A properly functioning low pressure sensor should produce a signal voltage that falls between these two thresholds during normal compressor operation. Voltages outside this range indicate either a failed sensor, a wiring problem, or in some cases a fault on the PCB itself that is misreading the signal.

Common causes include a damaged sensor, corroded or disconnected connector pins, pinched or broken signal wire, and short circuits caused by chafed wiring contacting the chassis. Because the fault is voltage-based, diagnosis should begin with a careful inspection of the sensor wiring harness and connector before condemning the sensor or PCB. If wiring checks out, measuring the voltage at the sensor connector with the compressor running will confirm whether the sensor itself is out of specification.

Source: manufacturer service documentation.

Common causes of t8

  1. 01

    Faulty low pressure sensor

    Part replacement

    The sensor itself may have failed internally, causing it to output a voltage below 0.4V (SHORT) or above 4.7V (OPEN). Replacing the sensor is often the fix after wiring has been ruled out.

  2. 02

    Loose or corroded sensor connector

    Wiring / connection

    A disconnected, corroded, or poorly seated connector at the low pressure sensor can cause an open circuit reading above 4.7V. Inspect and reseat the connector, cleaning any corrosion from the pins.

  3. 03

    Damaged sensor wiring harness

    Wiring / connection

    Chafed, pinched, or broken wires in the harness running to the low pressure sensor can create either a short to ground or an open circuit. Visually inspect the full length of the wiring harness for damage.

  4. 04

    Short circuit in sensor wiring

    Wiring / connection

    A wire contacting the chassis or another conductor can pull the signal voltage below 0.4V, triggering the SHORT error. Look for wires routed near sharp edges or heat sources.

  5. 05

    Defective PCB

    Part replacement

    If the sensor and all wiring check out within specification, the main control board may be misreading or failing to properly supply reference voltage to the sensor circuit. PCB replacement is typically a last resort after all other causes are eliminated.

See the test procedure for each cause

Frequently asked questions about t8

What does t8 mean on a Samsung air conditioner?
The T8 error code indicates a low pressure sensor OPEN or SHORT circuit fault that was detected while the compressor was running. The control board expects the sensor to produce a signal voltage between 0.4V and 4.7V during compressor operation. A reading below 0.4V is classified as a SHORT error, and a reading above 4.7V is classified as an OPEN error. The unit will typically stop compressor operation to prevent system damage until the fault is resolved.
Can I fix a T8 error myself on a Samsung air conditioner?
A homeowner with basic electrical knowledge can inspect the sensor wiring harness and connector for visible damage, corrosion, or loose connections, and those steps are a reasonable starting point. However, measuring sensor voltage with the compressor running and safely accessing refrigerant-side components requires proper training and tools. If the sensor or PCB needs replacement, a certified HVAC technician should perform the work, especially since the low pressure sensor is connected to the refrigerant circuit.
Is it safe to run my Samsung air conditioner with a T8 error?
Running the unit with an active T8 fault is not recommended. The low pressure sensor is part of the compressor protection system, and bypassing or ignoring a fault in this circuit can allow the compressor to operate under unsafe refrigerant pressure conditions. Continuing to run the system could result in compressor damage, which is significantly more expensive to repair than the sensor itself.
Will resetting my Samsung air conditioner clear the T8 error?
A power reset may temporarily clear the T8 error code, but the fault will return as soon as the compressor starts and the control board detects the abnormal sensor voltage again. Because the fault is triggered by a measurable electrical condition below 0.4V or above 4.7V, it will persist until the underlying wiring or sensor issue is physically repaired.
How much does it cost to fix a Samsung air conditioner T8 error?
Repair costs vary depending on what is causing the fault. If the issue is only a damaged wiring harness or a connector that needs cleaning, diagnostic labor may be the primary cost, typically in the range of $75 to $150. A low pressure sensor replacement, including parts and labor, generally falls in the $100 to $250 range. If the PCB is determined to be the root cause, costs can rise to $300 to $600 or more depending on the unit model and part availability.

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