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Error code reference

Samsung Air Conditioner Error Code E493

Output current sensor error of Fan1.

Samsung codesSamsung air conditioner codes

Output current sensor error of Fan1.

First step from the service manual

Replace Fan PCB.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What E493 means on a Samsung air conditioner

Error code E493 on a Samsung air conditioner indicates an output current sensor error on Fan1. This fault originates in the Fan PCB, which is responsible for controlling and monitoring the current output to the primary fan motor. The PCB continuously monitors the current flowing to the fan motor during operation. When the sensed current falls outside the expected operating range, either due to an abnormal spike or a complete loss of signal, the system triggers E493 and halts operation to prevent further damage.

The most common root cause of this error is a failure within the Fan PCB itself, including damaged current sensing circuitry, failed driver components, or corrupted control logic on the board. However, the fault can also originate from the fan motor drawing abnormal current due to winding degradation or mechanical resistance, which in turn causes the sensor circuit to report an out-of-range value. Wiring issues between the PCB and the motor, such as a loose connector or a damaged harness, can also interrupt the current feedback signal and produce this error.

Because the Fan PCB is identified as the primary replacement target in this diagnostic, the recommended first step is to replace the Fan PCB before attempting further motor-level diagnostics. Technicians should also inspect the wiring harness and motor connections for visible damage, corrosion, or intermittent contact before condemning the board outright, as connector issues can mimic PCB failures.

Source: manufacturer service documentation.

Common causes of E493

  1. 01

    Failed Fan PCB

    Part replacement

    The Fan PCB contains the current sensing circuitry that monitors Fan1 output. Internal component failure on this board is the most likely cause and the first component recommended for replacement.

  2. 02

    Damaged or loose wiring harness

    Wiring / connection

    A loose connector, corroded pin, or damaged wire between the Fan PCB and the fan motor can interrupt the current feedback signal and trigger a false sensor error. Inspect all connectors and harness routing for physical damage.

  3. 03

    Fan motor winding failure

    Part replacement

    A degraded or partially shorted fan motor winding can cause the motor to draw abnormal current, pushing the sensor reading outside acceptable limits. Check the motor for signs of overheating or winding resistance anomalies.

  4. 04

    Mechanical obstruction on the fan

    Wiring / connection

    A blocked or seized fan blade creates excessive load on the motor, which can cause abnormal current draw detected by the sensor circuit. Inspect the fan blade for obstructions, ice buildup, or bearing failure.

  5. 05

    Power supply irregularity to the Fan PCB

    Wiring / connection

    Unstable or insufficient voltage supplied to the Fan PCB can cause the current sensing circuit to produce erratic readings. Verify the supply voltage to the board is within the required operating range.

See the test procedure for each cause

Frequently asked questions about E493

What does E493 mean on a Samsung air conditioner?
E493 indicates an output current sensor error for Fan1 on a Samsung air conditioner. The Fan PCB monitors the current output to the primary fan motor and has detected a value outside the acceptable range. The system shuts down to prevent component damage. A technician will need to diagnose and likely replace the Fan PCB to resolve the fault.
Can I fix E493 on my Samsung air conditioner myself?
The primary fix for E493 is replacing the Fan PCB, which involves working with electrical components inside the unit. A knowledgeable DIYer can inspect the wiring harness and connectors for obvious damage as a first step. However, PCB replacement and motor diagnostics are best handled by a qualified technician, especially since the unit should be fully powered down before any internal inspection.
Is it safe to keep running my air conditioner when E493 appears?
No, you should not continue operating the unit when E493 is active. The system has detected an abnormal current condition in the fan circuit, and running the unit in this state risks further damage to the fan motor, PCB, or related components. Leave the unit off until the fault has been properly diagnosed and repaired.
Will resetting my Samsung air conditioner clear the E493 error?
A power reset may temporarily clear the error code, but if the underlying fault in the Fan PCB, wiring, or motor still exists, the code will return once the unit attempts to operate. Resetting is not a repair and should only be used as a temporary diagnostic step, not a solution.
How much does it cost to repair a Samsung air conditioner E493 error?
Repair costs for E493 vary depending on the specific fault found. Fan PCB replacement parts typically range from $80 to $250 or more depending on the model, plus labor costs that can range from $100 to $300 depending on your location and the technician's rates. If the fan motor itself has also failed, total repair costs will be higher.

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