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Error code reference

Samsung Air Conditioner Error Code E387

Hall IC connection error of Fan2.

Samsung codesSamsung air conditioner codes

Hall IC connection error of Fan2.

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What E387 means on a Samsung air conditioner

The E387 error code on a Samsung air conditioner indicates a Hall IC connection error on the second fan motor (Fan2). A Hall IC, or Hall effect integrated circuit, is a small sensor embedded in or mounted near a brushless DC fan motor that detects the position and rotational speed of the motor's rotor using magnetic field changes. The control board uses the signal pulses from the Hall IC to verify that the fan is spinning at the correct speed and in the correct sequence. When the E387 code appears, the main control board is not receiving a valid or expected signal from the Fan2 Hall IC, triggering a fault condition and halting normal operation.

The most common causes of this error fall into two categories: wiring and connection faults, or component failures within the fan motor assembly itself. Loose, corroded, or damaged wiring between the Hall IC and the control board can interrupt the signal path entirely. The Hall IC sensor itself can fail due to heat stress, moisture ingress, or physical damage, resulting in no output signal or an erratic one. In some cases, the fan motor bearings may have seized or the rotor may have stopped turning, which would also produce no Hall IC pulses even if the sensor itself is functional.

Because Fan2 typically refers to the secondary fan in the system, such as the indoor blower or the outdoor fan depending on the unit configuration, its failure can directly impact airflow and heat exchange efficiency. Diagnosing this error requires inspecting the wiring harness from Fan2 to the control board for continuity and secure connections, checking the Hall IC output signal with a multimeter or oscilloscope while the motor is energized, and evaluating whether the motor itself spins freely by hand when power is disconnected.

Source: manufacturer service documentation.

Common causes of E387

  1. 01

    Loose or disconnected wiring harness

    Wiring / connection

    The connector linking the Fan2 Hall IC to the main control board may have come loose, corroded, or developed a broken wire. Inspect the full harness run for secure connections, pinched wires, and visible corrosion at the connector pins.

  2. 02

    Failed Hall IC sensor

    Part replacement

    The Hall effect sensor inside or adjacent to the Fan2 motor can fail due to heat, moisture, or age, causing it to output no signal or an erratic signal. A multimeter or oscilloscope can be used to check for proper pulse output when the motor is energized.

  3. 03

    Fan2 motor failure or seized bearings

    Part replacement

    If the Fan2 motor is not spinning, the Hall IC will produce no pulses regardless of sensor condition. Check whether the motor shaft turns freely by hand when the unit is fully de-energized.

  4. 04

    Damaged or shorted signal wire

    Wiring / connection

    A wire in the Hall IC signal circuit may be chafed against a metal edge or shorted to ground, corrupting the signal reaching the control board. Carefully inspect the wiring path for abrasion damage or contact with sharp surfaces.

  5. 05

    Faulty main control board

    Part replacement

    If the wiring, Hall IC sensor, and motor all check out correctly, the control board input circuit that reads the Fan2 Hall IC signal may itself be defective. This is the least common cause and should only be considered after all other components are ruled out.

See the test procedure for each cause

Frequently asked questions about E387

What does E387 mean on a Samsung air conditioner?
E387 indicates a Hall IC connection error for Fan2, the second fan motor in the system. The Hall IC is a sensor that reports the fan motor's rotational speed and position to the control board. When the board does not receive a valid signal from this sensor, it triggers the E387 fault and shuts the system down to prevent damage. The root cause is typically a wiring fault, a failed sensor, or a failed motor.
Can I fix the E387 error myself?
Some basic diagnostics are within reach for a knowledgeable DIYer, such as inspecting and reseating the wiring connectors on the Fan2 motor. However, testing the Hall IC output signal requires a multimeter or oscilloscope and comfort working around energized components. Replacing the fan motor or control board should be performed by a qualified technician to ensure safe and proper installation.
Is it safe to keep running my air conditioner when E387 is displayed?
No, you should not continue operating the unit while E387 is active. The system has detected that Fan2 is not functioning correctly, which means airflow and heat exchange are compromised. Running the unit in this state could cause overheating of internal components and lead to additional damage beyond the original fault.
How much does it cost to repair an E387 error on a Samsung air conditioner?
Repair costs vary depending on the root cause. If the fix is simply reseating a loose connector, there may be little to no parts cost, though a service call fee typically applies. A replacement fan motor can range from roughly $80 to $250 or more for the part alone, with labor adding to the total. A control board replacement, if needed, generally costs more. Getting a diagnostic visit from a certified technician will clarify the exact repair needed.
Will resetting the air conditioner clear the E387 error code?
A power reset may temporarily clear the E387 code from the display, but the error will return if the underlying problem has not been resolved. Because this fault is tied to a hardware issue with the Fan2 motor circuit, resetting the unit does not fix the sensor, wiring, or motor problem causing the fault. A proper diagnosis and repair of the root cause is required to permanently resolve the error.

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