mypros+
Error code reference

Daewoo Air Conditioner Error Code CODE4

Compressor or electrical parts of compressor error

Daewoo codesDaewoo air conditioner codes

Compressor or electrical parts of compressor error - shown only in Emergency mode but unit continues working.

First step from the service manual

Check compressor and its electrical parts; check for gas leakage; check I/D sensor assembly.

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 CODE4.

  • 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 CODE4 means on a Daewoo air conditioner

CODE4 on a Daewoo air conditioner indicates a compressor or compressor electrical component fault. This error appears exclusively in Emergency mode, meaning the unit has detected an abnormal condition in the compressor circuit but has not shut down completely. Instead, it continues operating in a reduced or fallback state while alerting the technician to an underlying problem that requires attention. The compressor is the core refrigerant-pumping component of the system, and faults in its electrical supply, motor windings, or control circuitry can trigger this code.

The diagnostic scope for CODE4 covers several interconnected areas. The compressor itself may have internal winding faults, capacitor failure, or overload conditions. The electrical parts associated with the compressor, such as the run capacitor, contactor, or inverter drive components, should be tested for continuity, correct voltage output, and proper switching behavior. A refrigerant leak is also a potential trigger, as low refrigerant pressure places excessive strain on the compressor and can cause abnormal current draw, leading the control board to flag a compressor fault.

The indoor unit sensor assembly is included in the initial diagnostic because sensor misreadings can cause the control board to misinterpret operating conditions and incorrectly load or cycle the compressor. If the indoor temperature or evaporator sensors report inaccurate data, the system may run the compressor outside normal operating parameters. A full diagnostic should include checking sensor resistance values against specification, inspecting wiring harnesses for damage, performing a refrigerant pressure check, and testing compressor electrical components under load.

Source: manufacturer service documentation.

Common causes of CODE4

  1. 01

    Compressor winding or motor fault

    Part replacement

    Internal compressor winding degradation or a short circuit in the motor can cause abnormal current draw and trigger CODE4. Testing winding resistance across all terminals and comparing to specification will confirm this fault.

  2. 02

    Refrigerant leak causing low pressure

    Part replacement

    A refrigerant leak reduces system pressure, forcing the compressor to work harder and drawing higher than normal current. Connect manifold gauges to check suction and discharge pressures and inspect fittings and line sets for signs of oil residue or frost.

  3. 03

    Failed run capacitor or start components

    Part replacement

    A weak or failed run capacitor can prevent the compressor from starting or running correctly, producing electrical fault symptoms. Capacitors can be tested with a capacitance meter and should read within the rated microfarad value printed on the component.

  4. 04

    Faulty indoor unit sensor assembly

    Part replacement

    A defective indoor temperature or evaporator sensor can send incorrect readings to the control board, causing it to cycle or load the compressor improperly. Check sensor resistance values and inspect the sensor harness connector for corrosion or damage.

  5. 05

    Damaged or loose compressor wiring

    Wiring / connection

    Loose terminals, corroded connections, or damaged insulation in the compressor wiring harness can introduce resistance or intermittent open circuits that register as compressor electrical faults. Inspect all wiring at the compressor terminal block and along the harness routing.

See the test procedure for each cause

Frequently asked questions about CODE4

What does CODE4 mean on a Daewoo air_conditioner?
CODE4 indicates a compressor or compressor electrical component fault on a Daewoo air conditioner. The unit enters Emergency mode when this code appears, meaning it continues to operate but has detected an abnormal condition. The fault can originate in the compressor itself, its electrical supply components, refrigerant circuit, or the indoor sensor assembly. A technician should inspect all of these areas to identify the root cause.
Can I fix CODE4 myself on a Daewoo air conditioner?
Some basic checks, such as inspecting wiring connections and visually looking for obvious damage, can be done without specialized tools. However, diagnosing compressor winding faults, testing capacitors accurately, and checking refrigerant pressures all require proper equipment and training. Refrigerant handling is also regulated and must be performed by a certified technician in most regions. It is recommended to contact a qualified HVAC technician for a full diagnosis.
Is it safe to keep running my Daewoo air conditioner when CODE4 is displayed?
The unit continues operating in Emergency mode when CODE4 is active, which provides short-term functionality. However, running the system with an underlying compressor or electrical fault for an extended period can worsen the damage and lead to complete compressor failure. It is advisable to limit use and have the system inspected promptly to avoid a more costly repair.
How much does it cost to repair a CODE4 fault on a Daewoo air conditioner?
Repair costs vary significantly depending on the root cause. Replacing a run capacitor typically falls in a lower cost range, while compressor replacement is one of the most expensive repairs, often ranging from several hundred to over a thousand dollars including labor. Refrigerant leak repair and recharge costs depend on the severity of the leak and the amount of refrigerant required. A diagnostic visit from a technician will help determine the specific cost for your situation.
Will resetting my Daewoo air conditioner clear the CODE4 error?
Resetting the unit may temporarily clear the error display, but it will not resolve the underlying fault. If the compressor, its electrical components, refrigerant level, or sensor assembly have not been repaired, CODE4 will return. A reset should only be performed after the root cause has been diagnosed and corrected to confirm the repair was successful.

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