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Error code reference

Daewoo Air Conditioner Error Code CODE1

Room sensor open or short circuit

Daewoo codesDaewoo air conditioner codes

Room sensor open or short circuit - unit continuously works at fixed room temperature 18°C in heating mode or 32°C in cooling mode.

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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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What CODE1 means on a Daewoo air conditioner

CODE1 on a Daewoo air conditioner indicates a fault with the indoor unit room temperature sensor (also called the I/D room sensor or return air thermistor). This sensor is a negative temperature coefficient (NTC) thermistor that continuously monitors the ambient room temperature and sends that data to the control board so the unit can regulate compressor output and fan speed accurately. When the control board detects that the sensor signal is outside the expected resistance range, either because the circuit is open (no continuity) or shorted (resistance collapsed to near zero), it triggers CODE1 and switches the unit into a fixed-temperature failsafe mode.

In failsafe mode, the unit can no longer use real-time room temperature feedback to modulate operation. Instead, it assumes a fixed target: 18 degrees Celsius in heating mode or 32 degrees Celsius in cooling mode. This means the unit will run continuously without cycling off at the correct setpoint, which can cause discomfort and may result in overcooling or overheating the space depending on the mode in use. The system is not shut down entirely, but its efficiency and control are significantly compromised.

The most common root causes are a disconnected or corroded sensor connector at the indoor PCB or at the sensor harness, a physically damaged sensor probe (cracked housing or broken lead wire), or a thermistor that has drifted out of specification due to age or moisture ingress. The first diagnostic step is to inspect the sensor connector for secure seating and corrosion, then measure the sensor's resistance across its terminals and compare that reading against the temperature-resistance curve specified for the unit. A healthy NTC thermistor will show decreasing resistance as temperature rises.

Source: manufacturer service documentation.

Common causes of CODE1

  1. 01

    Loose or disconnected sensor connector

    Wiring / connection

    The sensor harness plug can work loose from the indoor control board over time due to vibration. Inspect the connector at both the PCB terminal and the sensor end for secure seating.

  2. 02

    Failed or out-of-range thermistor

    Part replacement

    The NTC thermistor inside the sensor probe can fail open or short internally due to age, heat stress, or moisture exposure. Measure resistance across the sensor leads; a reading of infinity (open) or near zero (short) confirms thermistor failure.

  3. 03

    Corroded or damaged connector pins

    Wiring / connection

    Moisture inside the indoor unit can cause oxidation on the sensor connector pins, creating high resistance or intermittent open circuits. Inspect pins for green or white corrosion and clean or replace the connector as needed.

  4. 04

    Broken or pinched sensor wire

    Part replacement

    The sensor lead wire can be pinched during reassembly after a service call or can develop a break from repeated flexing. Visually trace the wire from the sensor probe to the connector and check continuity along the length of the harness.

  5. 05

    Faulty indoor control board

    Part replacement

    If the sensor and its wiring test within acceptable resistance values but CODE1 persists, the input circuit on the indoor PCB may be damaged. This is the least common cause and should be investigated only after the sensor and wiring are confirmed good.

See the test procedure for each cause

Frequently asked questions about CODE1

What does CODE1 mean on a Daewoo air conditioner?
CODE1 indicates that the indoor unit room temperature sensor has an open circuit or short circuit condition. The control board cannot receive a valid temperature reading from the sensor, so the unit switches to a fixed failsafe mode: 18 degrees Celsius in heating mode or 32 degrees Celsius in cooling mode. The unit continues to run but cannot respond to the actual room temperature until the sensor fault is corrected.
Can I fix CODE1 on my Daewoo air conditioner myself?
If the cause is simply a loose connector, a homeowner comfortable working around electronics can carefully reseat the sensor plug on the indoor unit after powering the system off. However, if the sensor itself needs to be replaced or the control board is involved, the repair requires disassembling the indoor unit and handling electrical components, which is better suited for a qualified technician. Always disconnect power at the breaker before opening the indoor unit.
Is it safe to keep running my Daewoo air conditioner while CODE1 is active?
The unit will continue to operate in failsafe mode, so there is no immediate safety hazard in most cases. However, because it runs to a fixed temperature setpoint rather than your actual room conditions, it may overcool or overheat the space and will operate inefficiently. Running it for extended periods in this state can also add unnecessary wear to the compressor. It is best to address the fault promptly.
Will resetting the unit clear CODE1 on a Daewoo air conditioner?
A power reset may temporarily clear the error display if the fault was caused by an intermittent connection, but CODE1 will return as soon as the control board detects the sensor signal is still out of range. A reset does not repair the underlying sensor or wiring fault. The error will continue to reappear until the root cause is diagnosed and corrected.
How much does it cost to repair a CODE1 error on a Daewoo air conditioner?
If only the room temperature sensor needs replacement, parts and labor typically fall in the range of 80 to 200 dollars depending on your location and the technician's rates. If the indoor control board is also at fault, repair costs can rise to the range of 200 to 500 dollars or more. Getting a diagnostic assessment from a qualified technician first is the best way to determine which components actually need to be replaced before committing to a repair cost.

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