mypros+
Error code reference

Daewoo Air Conditioner Error Code CODE6

4-way valve or electrical parts of 4-way valve error

Daewoo codesDaewoo air conditioner codes

4-way valve or electrical parts of 4-way valve error - shown only in Emergency mode but unit continues working.

First step from the service manual

Check 4-way valve and its electrical parts; check for gas leakage.

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 CODE6.

  • 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 CODE6 means on a Daewoo air conditioner

CODE6 on a Daewoo air conditioner indicates a fault with the 4-way valve or its associated electrical components. The 4-way valve is a critical reversing valve in heat pump systems, responsible for directing refrigerant flow in one of two directions: either toward the indoor coil for cooling or toward the outdoor coil for heating. When this valve fails to switch correctly, or when the electrical components controlling it (such as the solenoid coil) malfunction, the system cannot reliably operate in both heating and cooling modes. Importantly, CODE6 is displayed only when the unit is running in Emergency mode, meaning the system continues to operate despite the fault rather than shutting down entirely.

The most common electrical component associated with this fault is the solenoid coil that actuates the 4-way valve. If the coil has an open circuit, a short, or receives incorrect voltage, the valve may fail to shift between positions. Mechanical issues within the valve body itself, such as a stuck slide or internal leakage caused by refrigerant pressure imbalances, can also trigger this code. Gas leakage is specifically flagged as a diagnostic concern because low refrigerant pressure can prevent the valve from achieving a proper position change, mimicking an electrical fault. Technicians should inspect both the electrical connections to the solenoid coil and the refrigerant charge as initial diagnostic steps.

Source: manufacturer service documentation.

Common causes of CODE6

  1. 01

    Faulty solenoid coil on the 4-way valve

    Part replacement

    The solenoid coil that actuates the reversing valve may have failed, with an open circuit or internal short preventing the valve from switching positions. Resistance testing of the coil terminals will confirm whether the coil is within specification.

  2. 02

    Refrigerant (gas) leakage

    Part replacement

    Low refrigerant charge can prevent the 4-way valve from building enough pressure differential to shift positions correctly, causing the system to log this fault. A refrigerant leak check using a leak detector or manifold gauge set is required to confirm.

  3. 03

    Stuck or mechanically failed 4-way valve

    Part replacement

    The internal slide within the valve body can become stuck due to debris, corrosion, or prolonged use in an intermediate position. This is a mechanical failure that does not resolve with electrical repairs and requires valve replacement.

  4. 04

    Wiring or connector fault at the solenoid

    Wiring / connection

    Damaged wiring, corroded terminals, or loose connectors between the control board and the solenoid coil can interrupt the signal needed to actuate the valve. Inspect all wiring and connector pins visually and with a multimeter.

  5. 05

    Control board output failure

    Part replacement

    If the control board is not supplying the correct voltage signal to the 4-way valve solenoid, the valve will not actuate properly even if the coil and wiring are intact. This can be confirmed by measuring voltage at the solenoid terminals during a mode switch command.

See the test procedure for each cause

Frequently asked questions about CODE6

What does CODE6 mean on a Daewoo air_conditioner?
CODE6 indicates a fault with the 4-way reversing valve or its electrical components, such as the solenoid coil. This valve controls the direction of refrigerant flow and is essential for switching between heating and cooling modes. The code appears only in Emergency mode, which means the unit continues to operate but the fault still requires investigation. Refrigerant leakage is also flagged as a possible contributing factor.
Can I fix CODE6 on my Daewoo air conditioner myself?
Some causes, such as loose wiring connections or corroded terminals at the solenoid coil, can be addressed by a knowledgeable DIYer with a multimeter. However, testing and replacing the solenoid coil, diagnosing refrigerant leaks, or replacing the 4-way valve itself requires specialized tools and, in most regions, EPA certification to handle refrigerants. It is recommended to have a licensed HVAC technician perform the full diagnosis.
Is CODE6 on a Daewoo air conditioner dangerous to ignore?
The unit will continue running in Emergency mode, so there is no immediate safety hazard in most cases. However, ignoring this code can lead to further damage if the root cause is refrigerant leakage, which can degrade compressor performance and cause additional component failures over time. Addressing the fault promptly will prevent more costly repairs later.
Will resetting the unit clear CODE6 on a Daewoo air conditioner?
A reset may temporarily clear the code from the display, but it will return if the underlying fault in the 4-way valve or its electrical components has not been repaired. Because the code appears in Emergency mode, the system has already detected an active condition that requires physical diagnosis and correction. Resetting without repairs is not a solution.
How much does it cost to repair a CODE6 fault on a Daewoo air conditioner?
Repair costs vary depending on the specific cause. Replacing a solenoid coil typically runs in the range of $75 to $200 including parts and labor. A full 4-way valve replacement is more involved and can range from $200 to $600 or more depending on system size and refrigerant handling requirements. If a refrigerant leak is also present, leak repair and recharge will add to the total cost.

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