Samsung Air Conditioner Error E403

⚡ Quick Answer: The Samsung Air Conditioner E403 error indicates a communication failure between the indoor and outdoor units, often triggered by freeze control issue... ✅ DIY Fixable

What Does Error E403 Mean?

The Samsung Air Conditioner E403 error indicates a communication failure between the indoor and outdoor units, often triggered by freeze control issues. This fault causes the compressor to stop operating, potentially due to frost buildup on the evaporator heat exchanger or reduced airflow from clogged filters. Other causes may include liquid flood back or abnormal refrigerant cycles, leading to inefficient cooling and possible system shutdown.

Common Symptoms:

  • Unit displays E403 code and shuts down compressor operation
  • Freezing or frost buildup suspected in evaporator heat exchanger
  • Airflow reduced due to clogged inlet or filters
  • Possible liquid flood back or refrigerant cycle abnormal condition

Possible Causes

  • Freeze control / liquid flood back detection (protective shutdown) (medium)
  • Blocked or dirty air filters / restricted airflow (medium)
  • Indoor unit evaporator sensor or temperature feedback out of expected range (medium)

How to Fix Error E403

DIY Fix Check and clean air filters

  1. Turn off the air conditioner and disconnect power.
  2. Open the indoor unit filter grille.
  3. Remove and inspect the air filters for dust and blockage.
  4. Clean the filters according to the manual (vacuum or wash) and let them dry.
  5. Reinstall filters, restore power, and restart the unit.

Technician Only Diagnose evaporator and refrigerant freezing / sensor condition

  1. Check for ice or frost buildup inside the indoor unit evaporator heat exchanger.
  2. Inspect and verify proper operation of evaporator temperature sensors (in/out) and correct resistance values.
  3. Verify airflow across indoor evaporator (fan operation and absence of obstruction).
  4. Check for refrigerant cycle anomalies including flood back or incorrect refrigerant charge.
  5. Reset the freeze control protection and test system operation.

Parts needed: Evaporator temperature sensor(s), Air filters, Indoor fan motor/blades (if obstructed), Refrigerant system components as indicated by diagnosis

🛑 When to Call a Pro:
  • If the E403 error persists after filter cleaning and basic checks.
  • If ice buildup inside the unit is extensive or refrigerant issues are suspected.
  • If sensor readings are out of range or indoor fan malfunction is detected.

Next step

Choose the next step for E403

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

Temperature Sensor

Monitors the internal temperature to ensure correct operation and prevent overheating.

Typical part-only price
$15 - $35
DIY difficulty
Easy
Estimated time
15-30 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

Appliance Air Filter

Captures dust and debris from the appliance's intake airflow.

$12 - $55 · Easy · 5-10 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 Communication Cable
resistance N/A
part_number DA61-06796A
voltage_rating 220V AC

Common Questions

What does E403 error mean on Samsung Air Conditioner?

E403 indicates a communication failure causing compressor shutdown due to freeze control issues.

Can I fix Samsung Air Conditioner E403 error myself?

Yes, you can clean air filters and check for airflow issues as a first step.

How much does it cost to fix E403 error?

Repair costs range from ¥10,000 to ¥60,000+, depending on parts and labor.

When should I call a technician for E403?

Call a technician if the error persists after cleaning filters or if ice buildup is extensive.

Sources & References

Data last verified: 2026-07-22

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