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Error code reference

Samsung Air Conditioner Error Code E389

V-limit error on Fan2 of compressor.

Samsung codesSamsung air conditioner codes

V-limit error on Fan2 of compressor.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
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What E389 means on a Samsung air conditioner

Error code E389 on a Samsung air conditioner indicates a V-limit error on Fan2 of the compressor. This fault relates to a voltage limit condition being exceeded or not met on the secondary fan motor associated with the compressor unit. In variable-speed and inverter-driven systems, fan motors are monitored continuously for voltage boundaries during operation. When the control board detects that Fan2's operating voltage has gone outside the acceptable range, it triggers E389 to protect the motor and associated drive circuitry from damage.

The compressor fan motors in Samsung systems are typically driven by dedicated motor driver circuits or inverter modules that regulate voltage and speed. A V-limit error can stem from a motor winding that has developed a short or open condition, altering the electrical load seen by the driver. It can also result from a failing motor capacitor (in single-phase motor designs), a degraded motor driver board, or wiring harness issues such as loose connectors or damaged insulation causing unexpected voltage drops or spikes.

Because this error directly involves the compressor section's cooling fan, continued operation without resolving the fault can result in compressor overheating due to inadequate heat dissipation. The system will typically shut down or restrict operation when E389 is active. Diagnostic focus should be placed on the Fan2 motor itself, its wiring connections from the motor driver to the motor terminals, and the driver board or control PCB that governs Fan2 operation.

Source: manufacturer service documentation.

Common causes of E389

  1. 01

    Fan2 Motor Failure

    Part replacement

    The Fan2 motor windings may have developed a short circuit or open circuit, causing the voltage drawn to fall outside the acceptable operating limits. Testing motor winding resistance and comparing against specification will help confirm this.

  2. 02

    Faulty Motor Driver Board or Inverter Module

    Part replacement

    The driver circuit responsible for powering and regulating Fan2 may be malfunctioning, outputting incorrect voltage levels. Inspecting the driver board for burnt components, swollen capacitors, or failed transistors is the primary check here.

  3. 03

    Loose or Damaged Wiring Harness

    Wiring / connection

    Corroded terminals, loose connectors, or chafed wiring between the control board and Fan2 motor can introduce resistance that disrupts voltage delivery. A careful visual inspection and connector reseat should be performed first.

  4. 04

    Failed Run Capacitor

    Part replacement

    If Fan2 uses a run capacitor, a degraded or failed capacitor can prevent the motor from drawing the correct voltage and current profile, triggering a V-limit fault. Capacitors can be tested with a capacitance meter.

  5. 05

    Control PCB Fault

    Part replacement

    The main or sub control PCB that monitors Fan2 voltage may itself be producing incorrect readings or failing to regulate signals properly. This is typically diagnosed after ruling out the motor and wiring as causes.

See the test procedure for each cause

Frequently asked questions about E389

What does E389 mean on a Samsung air conditioner?
E389 is a V-limit error associated with Fan2 of the compressor section. It means the control system detected that the voltage on the Fan2 motor circuit went outside the acceptable operating boundary. The unit will restrict or shut down operation to protect the fan motor and compressor from thermal or electrical damage. A technician should inspect the Fan2 motor, its wiring, and the driver circuitry to resolve the fault.
Can I fix error E389 myself?
Some basic checks, such as reseating wiring connectors and inspecting for visible damage to the Fan2 motor or its wiring, are within reach of a knowledgeable DIYer. However, replacing motor driver boards, inverter modules, or the fan motor itself involves working with high-voltage components and refrigerant-adjacent systems, which carries real safety risk. Professional service is strongly recommended for anything beyond a basic visual inspection.
Is it safe to keep running my air conditioner with error E389 active?
No. E389 indicates a voltage fault on the fan that cools the compressor. Running the system without a properly functioning compressor fan can cause the compressor to overheat, potentially leading to compressor failure, which is a very expensive repair. The unit should remain off until the fault is diagnosed and corrected.
Will resetting the unit clear error E389?
A power reset may temporarily clear the error code, but if the underlying fault with Fan2 or its drive circuit still exists, the code will return once the system attempts to operate. Resetting without repairing the root cause does not fix the problem and can increase the risk of further component damage.
How much does it cost to repair error E389 on a Samsung air conditioner?
Repair costs vary depending on which component has failed. A replacement fan motor or capacitor typically runs in the range of $80 to $250 for parts, while a motor driver board or control PCB can cost $150 to $500 or more. Adding labor charges, total repair costs commonly fall between $150 and $700 depending on the diagnosis, parts needed, and local service rates.

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