Daewoo Air Conditioner Error 3

⚡ Quick Answer: The Daewoo air conditioner error code 3 signifies a failure in the indoor temperature sensor, which can lead to erratic temperature readings and incon... ✅ DIY Fixable

What Does Error 3 Mean?

The Daewoo air conditioner error code 3 signifies a failure in the indoor temperature sensor, which can lead to erratic temperature readings and inconsistent cooling. This issue often stems from communication or connection problems between the indoor and outdoor units. It's essential to check the wiring and sensor connections to resolve this fault and restore optimal performance.

Common Symptoms:

  • Error code 3 displayed on indoor unit display
  • Possible failure to run or abnormal operation

Possible Causes

  • Communication/connection or sensor fixation issue between indoor and outdoor units (medium)
  • Potential gas leakage indicated in some community documentation (low)

How to Fix Error 3

DIY Fix Basic Inspection & Reset

  1. Turn off the air conditioner and disconnect power at the breaker.
  2. Wait a few minutes, then restore power and restart the unit to see if the error clears.
  3. Ensure remote control settings and indoor temperature settings are correct.

Technician Only Technician Diagnostic and Repair

  1. Check the voltage between N and Y on the terminal block and verify correct wiring connections between indoor and outdoor units.
  2. Inspect the relay KI on the power PCB and verify the indoor coil thermistor fixation and connections.
  3. Check for signs of refrigerant gas leakage and inspect sensors and communication wiring for faults.

Parts needed: Terminal block wiring harness, Relay KI on power PCB, Indoor coil thermistor, Refrigerant lines (for leakage inspection)

🛑 When to Call a Pro:
  • If basic reset and simple checks do not clear the error
  • If wiring or components inside units need inspection beyond user capability
  • When refrigerant system issues or gas leaks are suspected

Next step

Choose the next step for 3

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Based on diagnostic data

Most relevant component to inspect

Wiring Harness

Connects controls, sensors, motors, and other electrical components inside the appliance.

Typical part-only price
$20 - $120
DIY difficulty
Medium
Estimated time
30-90 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

Other parts options

Check related components first; use model search as a fallback.

Possible related component

Power Control Board

Distributes and switches electrical power for the appliance's major loads.

$90 - $260 · Hard · 30-75 mins

Check fit & price
Possible related component

Thermistor

Measures precise temperature changes and sends resistance feedback to the control board.

$15 - $35 · Easy · 15-30 mins

Check fit & price
Model number required

Model-compatible Air Conditioner parts

Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.

Find a part that fits my model

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Optional routine care

Maintenance supplies

These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.

Maintenance supply

Air Conditioner Fin Cleaner

For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.

View maintenance supply
Maintenance supply

Model-Compatible Washable AC Filter

A reusable filter option only where the appliance supports one. Match the full model, dimensions, and filter specification.

Compatibility check required: use the complete appliance model and compare the existing filter, bag, or specification before ordering.

Find one that fits my model

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.

Technical Specifications

wattage N/A
component Indoor Temperature Sensor
resistance 10k ohms at 25°C
part_number DAC-TS-001
voltage_rating 5V DC

Common Questions

What does 3 error mean on daewoo air conditioner?

Error 3 indicates a failure in the indoor temperature sensor, causing erratic readings and inconsistent cooling.

Can I fix daewoo air conditioner 3 error myself?

Yes, you can try resetting the unit and checking temperature settings as a first step.

How much does it cost to fix 3 error?

$100–$400 depending on parts and labor in your region.

When should I call a technician for 3?

Call a technician if the error persists after a reset or if wiring inspection is needed.

Data last verified: 2026-07-25

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