Samsung Air Conditioner Error Code 135

Error code 135 on a Samsung air conditioner indicates an indoor clean fan rotational frequency feedback error. The clean fan is a secondary blower component found in certain Samsung indoor units, responsible for circulating air through the internal air purification or clean air pathway. This error triggers when the unit's control board detects that the rotational speed signal being returned from the clean fan motor does not match the expected frequency, or when no feedback signal is received at all.

The feedback signal is typically a pulse output from the fan motor's hall sensor or tachometer circuit, sent back to the main PCB so the board can confirm the motor is spinning at the correct RPM. If that signal is absent, irregular, or out of range, the board logs error 135 and may shut down the affected function or the entire unit depending on unit configuration. Common causes include a broken or disconnected feedback wire between the motor and the control board, a failed hall sensor within the motor, or a motor that has seized or is running with significantly reduced torque due to bearing wear or capacitor degradation.

Diagnosis should begin by inspecting the feedback connection line from the clean fan motor to the control board, checking for loose connectors, pinched wiring, or corrosion at the terminals. After confirming wiring integrity, the actual rotational output of the motor should be measured to determine whether the motor spins at all when commanded. If the motor runs but produces no feedback signal, the internal sensor is likely at fault and the motor assembly will need replacement. If the motor does not spin, power supply and capacitor condition should be verified before condemning the motor.