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Error code reference

Daewoo Air Conditioner Error Code CODE2

Indoor coil (I/D) sensor open or short circuit

Daewoo codesDaewoo air conditioner codes

Indoor coil (I/D) sensor open or short circuit - unit does not work.

First step from the service manual

Check I/D sensor resistance and connection.

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

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What CODE2 means on a Daewoo air conditioner

CODE2 on a Daewoo air conditioner indicates a fault with the indoor coil (evaporator) temperature sensor, also called the I/D coil sensor. This sensor is a negative temperature coefficient (NTC) thermistor that monitors the temperature of the indoor evaporator coil in real time. The control board uses this data to regulate cooling cycles, prevent coil freezing, and manage defrost operations. When the board detects a resistance value outside the expected range for the sensor, it interprets this as either an open circuit (broken wire or failed sensor with infinite resistance) or a short circuit (near-zero resistance), and immediately shuts the unit down to prevent damage.

The most reliable first diagnostic step is to disconnect the sensor and measure its resistance with a multimeter. A healthy NTC thermistor will show a specific resistance value at room temperature, typically in the range of several kilohms, and that value should decrease predictably as temperature rises. A reading of zero ohms indicates a short, while a reading of infinite resistance (OL) confirms an open circuit. Either condition will trigger CODE2 and prevent the unit from operating.

Beyond the sensor itself, the wiring harness connecting the sensor to the main control board should be inspected carefully. Chafed insulation, corroded terminals, or a loose connector at the board can mimic sensor failure without the thermistor itself being defective. Resolving CODE2 requires confirming whether the fault lies in the sensor, the wiring, the connector, or in rare cases the control board input circuit.

Source: manufacturer service documentation.

Common causes of CODE2

  1. 01

    Failed indoor coil NTC thermistor

    Part replacement

    The thermistor itself has failed internally, producing either an open or short circuit. Testing with a multimeter will show either infinite resistance or near-zero resistance instead of the expected kilohm range at room temperature.

  2. 02

    Loose or disconnected sensor connector

    Wiring / connection

    The sensor plug at the main control board or at the sensor itself may have vibrated loose or been inadvertently disconnected during a filter cleaning. Reseating the connector firmly may resolve the fault immediately.

  3. 03

    Damaged wiring harness

    Part replacement

    The wires running from the coil sensor to the control board can become chafed, pinched, or corroded over time, causing an intermittent or permanent open circuit. Inspect the full wire run for visible damage or corrosion at terminal ends.

  4. 04

    Corroded or oxidized connector terminals

    Wiring / connection

    Moisture inside the indoor unit can cause the sensor connector pins to oxidize, increasing resistance at the connection point and triggering an open circuit fault. Cleaning or replacing the connector may correct the issue.

  5. 05

    Faulty main control board sensor input

    Part replacement

    In rare cases the sensor circuit on the main control board itself is damaged, causing it to misread a good sensor as open or shorted. This is typically diagnosed only after confirming the sensor and wiring both test correctly.

See the test procedure for each cause

Frequently asked questions about CODE2

What does CODE2 mean on a Daewoo air_conditioner?
CODE2 indicates that the indoor coil temperature sensor has been detected as either open or short circuited. This sensor monitors the evaporator coil temperature to manage cooling and prevent freezing. When the control board detects a resistance reading outside the valid range, it shuts the unit down completely and displays CODE2 to alert the user or technician.
Can I fix CODE2 on my Daewoo air conditioner myself?
Checking the sensor connector for looseness and reseating it is a straightforward task that many homeowners can attempt safely with the unit powered off. However, measuring sensor resistance with a multimeter and replacing the thermistor or wiring requires basic electrical knowledge and comfort working inside the indoor unit. If you are unsure about any step, contacting a qualified technician is the safer choice.
Is it safe to keep running my Daewoo air conditioner when CODE2 appears?
The unit will not operate while CODE2 is active, so continued use is not possible until the fault is resolved. This is a protective lockout rather than a minor warning. Do not attempt to bypass the fault, as the coil sensor protects against evaporator freeze-up and related compressor damage.
How much does it cost to repair a CODE2 fault on a Daewoo air conditioner?
If only the sensor needs replacement, parts typically cost in the range of $15 to $50 depending on the model, with labor adding $75 to $150 if a technician performs the work. If the control board requires replacement, total costs can rise to $150 to $400 or more. Costs vary by region and service provider.
Will resetting my Daewoo air conditioner clear the CODE2 error?
A power reset by unplugging the unit for several minutes may temporarily clear the displayed code, but CODE2 will return immediately if the underlying sensor fault is still present. Resetting without repairing the sensor or wiring is not a solution. The fault must be corrected physically before the unit will resume normal operation.

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