De'Longhi 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
- Turn the unit off and unplug it from power.
- Wait ~5–10 minutes to allow the unit to reset.
- Inspect the visible area around the temperature sensors for obvious disconnections or damage if safe to do so.
- Plug the unit back in and power on to see if the error clears.
Technician Only Sensor diagnosis and replacement
- Access the internal temperature sensors.
- Measure sensor resistance with a multimeter and compare to manufacturer specifications.
- Inspect wiring harness for damage, repair or replace as needed.
- Replace faulty temperature sensor if out of spec.
- Perform a full functional test after replacement.
Parts needed: Temperature/thermistor sensor, Wiring harness/connectors
- Error persists after basic reset and visible wiring checks
- Signs of refrigerant leaks or unusual noises
- Sensor replacement does not clear error
Next step
Choose the next step for E3
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Thermistor
Measures precise temperature changes and sends resistance feedback to the control board.
- 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.
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.
Wiring Harness
Connects controls, sensors, motors, and other electrical components inside the appliance.
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.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
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.
Air Conditioner Fin Cleaner
For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.
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.
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 | 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: 2026-07-26
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