Delonghi Air Conditioner Error F3

⚡ Quick Answer: The F3 error code on your De’Longhi air conditioner signifies a failure in the indoor temperature sensor. This issue often leads to inaccurate tempe... ⚠️ Difficulty Varies

What Does Error F3 Mean?

The F3 error code on your De’Longhi air conditioner signifies a failure in the indoor temperature sensor. This issue often leads to inaccurate temperature readings and can cause the unit to stop cooling effectively or enter a protective shutdown mode. To resolve this, a power reset may be attempted, but persistent issues typically require professional inspection of the sensors and wiring.

Common Symptoms:

  • Unit displays F3 on screen instead of normal temperature/settings
  • System may stop cooling or shut down protection mode

Possible Causes

  • Indoor Temperature Sensor

How to Fix Error F3

DIY Fix Basic checks and reset

  1. Turn off the air conditioner and disconnect power for several minutes
  2. Restart the unit to see if F3 clears

Technician Only Inspect sensors and wiring

  1. Use a multimeter to measure temperature sensor resistance values
  2. Check for loose or damaged sensor wiring and connectors
  3. Replace the sensor if it is defective

Parts needed: Temperature sensors, Wiring harness/connectors

🛑 When to Call a Pro:
  • If the F3 code persists after a power reset
  • If you are uncomfortable inspecting internal components
  • If you suspect wiring, sensor, or control board damage

Next step

Choose the next step for F3

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.

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Technical Specifications

wattage N/A
component Indoor Temperature Sensor
resistance 2-5 kOhms
part_number DLSENSOR1234
voltage_rating 12V DC

Common Questions

What does F3 error mean on delonghi air conditioner?

The F3 error indicates a failure in the indoor temperature sensor, causing inaccurate readings and possible cooling issues.

Can I fix delonghi air conditioner F3 error myself?

You can try resetting the unit by turning it off and disconnecting power for a few minutes, but persistent issues may require professional help.

How much does it cost to fix F3 error?

The estimated cost to repair the F3 error ranges from ¥5,000 to ¥15,000, depending on the region and model.

When should I call a technician for F3?

Call a technician if the F3 code remains after a power reset, or if you're uncomfortable inspecting internal components.

Sources & References

Data last verified: 2026-04-23

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