mypros+
Error code reference

Daewoo Air Conditioner Error Code 4

Indoor fan motor, motor connector, or PCB fault.

Daewoo codesDaewoo air conditioner codes

Indoor fan motor, motor connector, or PCB fault.

First step from the service manual

Check the circuit of Motor Control.

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

MyPros+ Max

Get the full diagnostic procedure for 4.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What 4 means on a Daewoo air conditioner

Error code 4 on a Daewoo air conditioner indicates a fault within the indoor fan motor circuit. This encompasses the fan motor itself, the wiring harness and connector that supply it, or the printed circuit board (PCB) that controls its operation. The indoor fan motor is responsible for circulating conditioned air through the indoor unit and across the evaporator coil. When the control system detects an abnormal signal or a loss of feedback from the motor circuit, it triggers this fault code and halts operation to prevent further damage.

The first diagnostic step is to inspect the motor control circuit thoroughly. This begins with checking the motor connector for loose pins, corrosion, or damaged wiring. A loose or oxidized connection can cause intermittent or complete loss of motor communication, mimicking a failed motor. Technicians should also verify that the motor windings have continuity and that there are no shorts to ground. If the wiring and connector check out, the fan motor itself should be tested for proper resistance across its terminals.

If the motor and its wiring appear serviceable, the indoor PCB becomes the primary suspect. The PCB contains the motor drive circuitry, including capacitors and control relays that regulate fan speed and direction. A failed driver component on the board can produce identical symptoms to a seized or open-circuit motor. In some cases, power supply irregularities reaching the PCB can also cause this fault. A systematic check from the motor connector back to the board will isolate the defective component.

Source: manufacturer service documentation.

Common causes of 4

  1. 01

    Loose or corroded motor connector

    Wiring / connection

    The connector between the fan motor and the PCB can loosen over time or develop corrosion on its pins, interrupting the motor control signal. Inspect the connector for bent pins, oxidation, or a poor seating fit.

  2. 02

    Failed indoor fan motor

    Part replacement

    The fan motor windings can open or short internally, preventing the motor from running. Test the motor terminals for correct continuity and resistance values; an open or shorted winding confirms motor failure.

  3. 03

    Damaged motor wiring harness

    Part replacement

    The wiring between the motor and the PCB can fray, pinch, or break, especially near routing clips or sharp edges inside the unit. A visual inspection and continuity test of each wire will identify any open or shorted conductors.

  4. 04

    Faulty indoor PCB

    Part replacement

    The PCB motor driver circuitry can fail due to component degradation or power surges, causing the board to incorrectly signal a motor fault or fail to drive the motor at all. If the motor and wiring test correctly, the PCB is the likely fault.

  5. 05

    Mechanical obstruction in the fan

    Wiring / connection

    Debris or a buildup of dust can physically jam the indoor blower wheel, causing the motor to stall and the control system to register a fault. Inspect the blower wheel for blockages or binding before replacing components.

See the test procedure for each cause

Frequently asked questions about 4

What does 4 mean on a Daewoo air_conditioner?
Error code 4 on a Daewoo air conditioner indicates a fault detected in the indoor fan motor circuit. The problem could originate from the fan motor itself, the motor connector and wiring harness, or the indoor PCB that controls the motor. The unit shuts down to prevent further damage until the fault is resolved.
Can I fix error code 4 on my Daewoo air conditioner myself?
Some basic checks are within reach of a knowledgeable DIYer, such as visually inspecting the motor connector for loose or corroded pins and clearing any debris from the blower wheel. However, testing motor winding resistance, diagnosing PCB faults, and replacing internal components typically require electrical knowledge and proper tools. It is advisable to have a qualified technician handle anything beyond a visual inspection and connector reseating.
Is it safe to keep running my Daewoo air conditioner when error code 4 appears?
No, you should not attempt to bypass or continue operating the unit when error code 4 is active. The fault indicates a motor circuit problem that has caused the system to shut itself down as a protective measure. Forcing operation could damage the PCB, overheat wiring, or cause further component failure.
Will resetting the unit clear error code 4 on a Daewoo air conditioner?
A power reset may temporarily clear the code if the fault was caused by a transient electrical event, but it will return if the underlying problem is not corrected. Persistent reappearance of error code 4 after a reset confirms that a physical fault exists in the motor, connector, or PCB and must be diagnosed and repaired.
How much does it cost to repair error code 4 on a Daewoo air conditioner?
Repair costs vary depending on which component has failed. Reseating a connector or clearing a mechanical obstruction costs little beyond a service call fee, which typically ranges from $60 to $120. Replacing the indoor fan motor generally runs $150 to $400 including parts and labor, while a replacement indoor PCB can range from $200 to $500 or more depending on parts availability and labor rates in your area.

Related Daewoo air conditioner codes

All Daewoo air conditioner codes
View all 45 Daewoo air conditioner codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass