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Samsung Air Conditioner Error Code E348

Lock error on Fan2 of outdoor unit.

Samsung codesSamsung air conditioner codes

Lock error on Fan2 of outdoor unit.

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What E348 means on a Samsung air conditioner

Error code E348 on a Samsung air conditioner indicates a lock error on the second outdoor unit fan motor (Fan2). A lock error means the motor has stalled or failed to reach its commanded rotational speed within the expected timeframe. The outdoor unit control board monitors fan motor feedback signals continuously, and when Fan2 is detected as locked, seized, or otherwise unable to rotate freely, the system triggers this fault code and typically halts operation to prevent overheating of the motor windings and drive circuitry.

The most common hardware causes include a physically seized fan motor due to bearing failure, foreign object obstruction in the fan blade path, or a failed motor winding. The motor's Hall effect sensors or encoder feedback circuit may also be reporting incorrect or absent signals to the inverter board, causing the controller to interpret the motor as locked even if mechanical rotation is not fully impeded. Wiring harness issues between the outdoor unit PCB and the Fan2 motor, including damaged connectors or broken signal wires, can produce the same fault condition.

Because this error is specific to the Fan2 position in outdoor units that use multiple fan motors, the diagnostic focus should remain on Fan2 and its associated drive circuitry rather than the full outdoor unit. The outdoor unit PCB controls motor speed via a dedicated output stage or sub-board, so failure of that drive circuit is also a possible root cause. Resolving the fault typically requires hands-on inspection of the fan assembly, motor winding resistance checks, and verification of feedback signal continuity.

Source: manufacturer service documentation.

Common causes of E348

  1. 01

    Seized or failed Fan2 motor bearings

    Part replacement

    Bearing wear or failure can cause the motor shaft to lock up, preventing rotation. You can often detect this by attempting to spin the fan blade by hand with power off; it should rotate freely with minimal resistance.

  2. 02

    Foreign object obstructing the fan blade

    Wiring / connection

    Debris such as leaves, twigs, or plastic material can become lodged between the fan blade and shroud, physically preventing rotation. Inspect the outdoor unit fan compartment visually and remove any obstruction.

  3. 03

    Wiring harness or connector fault

    Wiring / connection

    Damaged wiring or a corroded connector between the outdoor PCB and the Fan2 motor can interrupt the control or feedback signal, causing a false lock detection. Inspect the harness for chafing, corrosion, or loose pins.

  4. 04

    Fan2 motor winding failure

    Part replacement

    An open or shorted winding inside the motor will prevent it from generating torque. This can be identified by checking motor winding resistance with a multimeter and comparing readings across phases for balance and continuity.

  5. 05

    Outdoor unit PCB or fan drive circuit failure

    Part replacement

    If the control board's output stage responsible for driving Fan2 has failed, the motor will not receive proper power or control signals regardless of the motor's own condition. This is suspected when the motor and wiring check out correctly but the fault persists.

See the test procedure for each cause

Frequently asked questions about E348

What does E348 mean on a Samsung air conditioner?
E348 indicates a lock error on the second outdoor unit fan motor (Fan2). The control system detected that Fan2 has stalled or is unable to rotate as commanded. This causes the system to shut down to protect the motor and associated electronics from damage.
Can I fix E348 myself, or do I need a technician?
A homeowner can safely check for visible obstructions around the outdoor unit fan blades with the unit powered off. However, diagnosing motor winding failures, wiring faults, and PCB issues requires electrical testing tools and knowledge of refrigeration systems, so most repairs beyond debris removal should be handled by a qualified technician.
Is it safe to keep running my air conditioner when E348 is displayed?
No. The system typically shuts down automatically when E348 is triggered to prevent overheating of the fan motor and drive circuitry. Attempting to bypass or ignore the fault and force the unit to run could cause further damage to the outdoor unit electronics or motor windings.
Will resetting the unit clear the E348 error?
A power reset may temporarily clear the fault code, but if the underlying cause such as a seized motor, obstruction, or wiring fault is still present, the error will return quickly after the unit attempts to operate again. A reset alone does not fix the root problem and should only be used as part of a diagnostic process.
How much does it cost to repair a Samsung air conditioner showing E348?
Repair costs vary depending on the root cause. Clearing a physical obstruction may cost only a service call fee, typically in the range of $75 to $150. Replacing the Fan2 motor can range from $150 to $400 or more depending on the model and labor involved. If the outdoor unit PCB needs replacement, costs can be higher, often in the $300 to $600 range including parts and labor.

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