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Error code reference

Samsung Air Conditioner Error Code E385

Error due to input current of inverter 2.

Samsung codesSamsung air conditioner codes

Error due to input current of inverter 2.

First step from the service manual

Replace inverter 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 E385 means on a Samsung air conditioner

The E385 error code on a Samsung air conditioner indicates a fault detected in the input current of the second inverter (Inverter 2). Inverter-driven systems use variable frequency drives to control compressor motor speed, and the inverter PCB continuously monitors its own input current to ensure operation within safe parameters. When the detected input current falls outside the acceptable range, either too high or too low, the control system triggers E385 to protect the compressor and associated power components from damage.

The inverter PCB itself is the primary suspect when this error appears. The board contains current sensing circuits, IPM (Intelligent Power Module) components, and gate driver circuitry that can fail due to power surges, sustained overload conditions, or component aging. A fault in any of these internal circuits can produce erroneous or out-of-range current readings, causing the system to shut down and log E385 even if the compressor or power supply are functioning correctly.

Additionally, wiring issues between the power supply and the inverter board, such as loose terminal connections or damaged harness conductors, can introduce resistance or intermittent contact that distorts current readings. Problems with the incoming power supply, including voltage imbalance or fluctuation, can also stress inverter input stages and contribute to this fault. Because the first recommended diagnostic step is inverter PCB replacement, internal board failure is considered the most probable root cause when this code is active.

Source: manufacturer service documentation.

Common causes of E385

  1. 01

    Failed Inverter 2 PCB

    Part replacement

    Internal failure of the second inverter circuit board, including damage to the IPM, current sensing components, or gate driver circuits, is the most common cause. Replacement of the inverter PCB is the primary recommended diagnostic and repair action.

  2. 02

    Power supply voltage irregularities

    Wiring / connection

    Voltage imbalance, surges, or sustained under-voltage at the unit's power input can stress inverter input stages and trigger input current faults. Check incoming supply voltage for stability and correct phase balance.

  3. 03

    Loose or damaged wiring to the inverter board

    Wiring / connection

    Corroded terminals, loose connector pins, or damaged wiring harnesses between the power supply and the inverter PCB can cause abnormal current readings. Inspect all power and signal connectors at the inverter board for secure seating and continuity.

  4. 04

    Compressor winding fault loading the inverter

    Part replacement

    A partial short or degraded insulation resistance in the compressor windings can cause excessive current draw that stresses the inverter input stage. Measure compressor winding resistance and insulation resistance to rule this out.

  5. 05

    Contaminated or shorted inverter input capacitors

    Part replacement

    Electrolytic capacitors on the inverter DC bus can degrade or fail, causing abnormal input current behavior detected by the board's sensing circuits. Visually inspect capacitors for bulging or leakage and test capacitance if equipment is available.

See the test procedure for each cause

Frequently asked questions about E385

What does E385 mean on a Samsung air conditioner?
E385 indicates an error related to the input current of Inverter 2, the second inverter PCB responsible for controlling compressor speed. The system detected that the input current is outside acceptable operating limits. This is a protective shutdown to prevent damage to the inverter board and compressor. A qualified technician should inspect and likely replace the inverter PCB to resolve this fault.
Can I fix E385 on my Samsung air conditioner myself?
This repair is not recommended for untrained individuals because it involves high-voltage components inside the inverter section of the unit. The primary repair step is replacing the inverter PCB, which requires safely discharging capacitors and handling live electrical assemblies. A licensed HVAC or appliance technician should perform this diagnosis and repair.
Will resetting my Samsung air conditioner clear the E385 error?
A power reset may temporarily clear the error display, but if the underlying inverter PCB or electrical fault remains, the E385 code will return once the unit attempts to operate again. Resetting does not repair the faulty component. Persistent reappearance of E385 after a reset confirms that a hardware fault requires attention.
Is it safe to run my air conditioner when E385 is displayed?
No, you should not attempt to continue running the unit while E385 is active. The error indicates an inverter input current fault, and continued operation could cause further damage to the inverter board, compressor, or associated electrical components. Leave the unit powered off until the fault is diagnosed and repaired by a technician.
How much does it cost to repair a Samsung air conditioner E385 error?
Repair costs depend on whether the issue is a wiring or connection problem versus a full inverter PCB replacement. Labor charges for diagnosis and repair typically range from $80 to $200 or more depending on your region and the complexity of accessing the inverter. If the inverter PCB itself requires replacement, parts costs can add another $150 to $500 or higher depending on the specific unit model. Getting a written estimate before authorizing parts replacement is advisable.

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