Samsung Air Conditioner Error Code E346

Error code E346 on a Samsung air conditioner indicates an operation failure of the outdoor unit's second fan motor, referred to as Fan2. This fan is one of multiple fans in the outdoor unit responsible for drawing air across the condenser coil to facilitate heat rejection. When the control board detects that Fan2 is not operating as expected, whether due to a lack of feedback signal, incorrect speed, or complete failure to start, it triggers this fault code and typically shuts down or restricts system operation to prevent damage to the compressor and refrigerant circuit.

The most likely root causes fall into three categories: electrical failures, mechanical failures, and control circuit problems. Electrically, the fan motor winding may be open or shorted, the capacitor (if the motor uses one) may have failed, or wiring connections to the motor may be loose, corroded, or broken. Mechanically, the fan blade may be seized, obstructed by debris, or the motor bearings may have failed, causing the motor to draw excessive current or stall. On inverter-driven systems, the fan motor driver circuit or IPM (Intelligent Power Module) on the outdoor unit PCB may also be at fault.

Diagnosing this fault requires confirming that Fan2 physically attempts to spin on startup, checking supply voltage to the motor, measuring motor winding resistance, and inspecting the motor driver output from the control board. If the motor receives correct voltage but fails to run, the motor itself is the likely culprit. If no voltage is present at the motor terminals during expected operation, the control board or associated wiring is suspect.