Delonghi Air Conditioner Error E3

⚡ Quick Answer: The E3 error code on your Delonghi air conditioner indicates a malfunction in the temperature sensor, commonly leading to inaccurate temperature readi... ✅ DIY Fixable

What Does Error E3 Mean?

The E3 error code on your Delonghi air conditioner indicates a malfunction in the temperature sensor, commonly leading to inaccurate temperature readings and erratic cooling performance. This issue may cause the unit to stop cooling entirely and prevent the compressor from starting, resulting in poor temperature regulation.

Common Symptoms:

  • Display shows “E3” and unit stops cooling
  • Temperature regulation issues or erratic behaviour
  • Unit fails to start compressor or maintain set temperature

Possible Causes

  • Temperature sensor malfunction (indoor/evaporator) (medium)
  • Sensor wiring connection issues (medium)

How to Fix Error E3

DIY Fix Basic checks and reset

  1. Turn the unit off and unplug it from power.
  2. Wait ~5–10 minutes to allow the unit to reset.
  3. Inspect the visible area around the temperature sensors for obvious disconnections or damage if safe to do so.
  4. Plug the unit back in and power on to see if the error clears.

Technician Only Sensor diagnosis and replacement

  1. Access the internal temperature sensors.
  2. Measure sensor resistance with a multimeter and compare to manufacturer specifications.
  3. Inspect wiring harness for damage, repair or replace as needed.
  4. Replace faulty temperature sensor if out of spec.
  5. Perform a full functional test after replacement.

Parts needed: Temperature/thermistor sensor, Wiring harness/connectors

🛑 When to Call a Pro:
  • Error persists after basic reset and visible wiring checks
  • Signs of refrigerant leaks or unusual noises
  • Sensor replacement does not clear error

Technical Specifications

wattage N/A
component Temperature Sensor
resistance 10k ohms
part_number DLS-TS-100
voltage_rating 120V AC

Common Questions

What does E3 error mean on delonghi air conditioner?

E3 error indicates a temperature sensor malfunction, causing erratic cooling and inaccurate readings.

Can I fix delonghi air conditioner E3 error myself?

Yes, you can perform basic checks and resets by unplugging the unit and inspecting the sensor area.

How much does it cost to fix E3 error?

The repair cost for E3 error can range from $50 to $250 depending on the parts and labor involved.

When should I call a technician for E3?

Call a technician if the error persists after a reset, if you notice refrigerant leaks, or if the sensor replacement does not resolve the issue.

Data last verified: 2026-04-23

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