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Error code reference

Samsung Air Conditioner Error Code E6

Abnormal outdoor temperature sensor (voltage 4.9V and higher or 0.5V and lower).

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Abnormal outdoor temperature sensor (voltage 4.9V and higher or 0.5V and lower).

First step from the service manual

Check outdoor unit thermistor and outdoor unit PCB.

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 E6 means on a Samsung air conditioner

The E6 error code on a Samsung air conditioner indicates an abnormal reading from the outdoor unit temperature sensor, also called the outdoor thermistor. The system monitors the voltage signal from this sensor continuously, and E6 triggers when that voltage falls to 0.5V or below, or rises to 4.9V or higher. These voltage thresholds correspond to open-circuit and short-circuit fault conditions in the sensor or its wiring circuit. A properly functioning thermistor produces a voltage signal within a normal operating band, shifting resistance as outdoor temperature changes. When the signal goes out of range at either extreme, the control board cannot calculate accurate temperature data and flags the fault.

The outdoor thermistor is a negative temperature coefficient (NTC) resistor mounted in the outdoor unit, typically positioned to measure ambient or coil temperature. Its resistance changes predictably with temperature, and the PCB interprets that resistance as a voltage signal. A reading near 4.9V or above suggests an open circuit, meaning the sensor has failed internally, a connector has pulled loose, or the wiring harness is broken. A reading at 0.5V or below suggests a short circuit, which can result from a damaged sensor, pinched wiring, or moisture intrusion causing a conductive path to ground.

Diagnosis begins with a physical inspection of the outdoor thermistor and its wiring harness, checking for corrosion, loose connectors, pinched wires, or visible damage. The thermistor resistance should be measured with a multimeter and compared against the temperature-resistance curve specified for the sensor. If resistance is within spec, attention shifts to the outdoor PCB itself, which may have a faulty input circuit causing incorrect voltage interpretation even with a good sensor.

Source: manufacturer service documentation.

Common causes of E6

  1. 01

    Failed outdoor thermistor

    Part replacement

    The thermistor itself has failed open or shorted internally, producing a voltage signal outside the 0.5V to 4.9V operating range. Resistance measured at the sensor terminals will be infinite (open) or near zero (short) rather than matching expected values for the current ambient temperature.

  2. 02

    Loose or disconnected wiring connector

    Wiring / connection

    Vibration or weather exposure can cause the thermistor connector at the outdoor PCB or at the sensor itself to work loose, breaking the circuit and pushing the voltage signal to the high threshold near 4.9V. Inspect all connectors in the thermistor circuit for secure seating and corrosion.

  3. 03

    Damaged or pinched wiring harness

    Part replacement

    The wiring between the thermistor and the outdoor PCB can be pinched by sheet metal edges, chewed by pests, or degraded by UV and moisture exposure, causing either an open or short circuit condition. Carefully trace the full length of the harness and look for insulation damage or bare conductors.

  4. 04

    Moisture or corrosion at connector

    Wiring / connection

    Water intrusion into the thermistor connector can cause corrosion on the terminals or create a conductive path that shorts the signal low, triggering the 0.5V fault threshold. Look for discoloration, oxidation, or water residue at connector points on the outdoor unit.

  5. 05

    Faulty outdoor unit PCB

    Part replacement

    If the thermistor and all wiring test correctly but the E6 code persists, the input circuit on the outdoor PCB may be defective, misreading a valid sensor signal as out of range. PCB failure is less common but should be considered after the sensor and wiring are confirmed good.

See the test procedure for each cause

Frequently asked questions about E6

What does E6 mean on a Samsung air conditioner?
E6 indicates that the outdoor unit temperature sensor is producing a voltage signal outside the acceptable range, specifically 4.9V or higher (suggesting an open circuit) or 0.5V or lower (suggesting a short circuit). The control board relies on this sensor to monitor outdoor conditions, and when the signal is out of range the system stops operating to prevent damage. The fault points to the outdoor thermistor, its wiring, or the outdoor PCB.
Can I fix the E6 error myself?
Some basic checks are accessible to a knowledgeable DIYer, such as inspecting the outdoor unit wiring harness for visible damage and reseating connectors. However, accurately diagnosing whether the thermistor, wiring, or PCB is at fault requires a multimeter and familiarity with resistance-temperature relationships for NTC sensors. If the outdoor PCB needs replacement, that work is best handled by a qualified technician.
Is it safe to run my air conditioner with an E6 error?
No, the system will typically shut down when E6 is active specifically to protect components from operating without valid temperature data. Attempting to bypass or ignore the fault is not recommended, as the unit cannot regulate itself correctly without accurate outdoor temperature readings. The issue should be diagnosed and repaired before returning the unit to regular operation.
Will resetting the air conditioner clear the E6 error?
A power reset may temporarily clear the fault display, but E6 will return as soon as the system restarts and detects the out-of-range voltage signal again. Resetting does not address the underlying problem with the sensor, wiring, or PCB. A proper repair is required to permanently resolve the fault.
How much does it cost to repair an E6 error on a Samsung air conditioner?
Repair costs vary depending on the root cause. Replacing an outdoor thermistor is generally the least expensive fix, with parts typically in the range of $15 to $60 and modest labor costs. If the outdoor PCB is at fault, parts alone can range from $100 to $300 or more depending on the model, plus labor. Getting a diagnostic visit from a certified technician will give you an accurate estimate for your specific unit.

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