De'Longhi Air Conditioner: not cooling

Professional Repair Guide

What is this symptom?

Is your Delonghi air conditioner running but not cooling the air? This common issue can stem from dirty filters, incorrect settings, or airflow restrictions. Even with the fan blowing, you may notice inadequate cooling. Understanding the possible causes can help you troubleshoot effectively and restore comfort to your space.

Urgency: Medium

Important Tips for De'Longhi Models

  • Delonghi portable AC models may show specific error codes indicating filter issues (CF), water tank full (HL), or sensor faults that relate to cooling performance
  • Some Delonghi units have built-in safety 3-minute restart delay to protect the compressor; perceived lack of cooling shortly after restart may be due to this feature

Possible Causes

Dirty or clogged air filter restricting airflow

How to Identify: Reduced airflow, warm air despite running, visual debris buildup on filter

Part: Air filter

Incorrect temperature or mode settings

How to Identify: Unit set on fan or dry mode rather than cool; temperature set above room temp

Part: Thermostat/Control panel

Low refrigerant levels or refrigerant leak

How to Identify: Warm air output, hissing noise, potential ice formation on coils

Part: Refrigerant system

Blocked or restricted airflow (vents or exhaust hose on portable units)

How to Identify: Warm discharge air, obstructed vents, kinked exhaust hose on portable models

Part: Airflow vents/hose

Compressor or internal mechanical failure

How to Identify: Unusual noises, compressor not running, unit cycling on/off rapidly

Part: Compressor/fan motor

DIY Solutions

Clean or replace the air filter

Easy 10-15 minutes
Tools Needed: screwdriver (if required), soft brush or vacuum
  1. Turn off and unplug the air conditioner
  2. Open the front panel and remove the air filter
  3. Clean filter with warm soapy water or vacuum debris
  4. Allow filter to dry fully and reinstall
  5. Restart unit and check cooling performance
⚠️ Safety First: Ensure power is disconnected before opening unit

Verify and adjust thermostat/mode settings

Easy 5 minutes
  1. Check that unit is set to "cool" mode
  2. Set target temperature lower than current room temp
  3. Ensure fan setting is appropriate (AUTO/Cool)
  4. Replace remote batteries and test direct unit controls if using remote

Ensure vents and exhaust hoses are clear

Easy 10 minutes
Tools Needed: soft brush or vacuum
  1. Inspect intake and output vents for debris or blockage
  2. For portable units, check that exhaust hose isn’t kinked or blocked
  3. Clean vents and reposition hose for unrestricted airflow
  4. Restart unit to see if cooling improves

Next step

Choose the next step for not cooling

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

Check during diagnosis

Most relevant component to inspect

Appliance Air Filter

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

Typical part-only price
$12 - $55
DIY difficulty
Easy
Estimated time
5-10 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

Thermostat

Regulates temperature by turning the heating or cooling system on or off.

$15 - $40 · Easy · 15-30 mins

Check fit & price
Possible related component

Compressor

Compresses refrigerant within the sealed cooling system and requires specialized service equipment.

$180 - $600 · Hard · 120-240 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

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.

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.

Professional Repairs

Refrigerant leak repair and recharge

Estimated Cost: $150 - $400

Compressor or internal component replacement

Estimated Cost: $300 - $800+

When to Call a Professional

Warm air persists after cleaning filters and checking settings
Hissing noises or suspected refrigerant leak
Unit cycles rapidly on/off or compressor doesn’t run
Unusual smells, electrical issues, or visible damage

Preventive Maintenance

  • Clean or replace air filter: Airflow restriction and reduced cooling efficiency
    Frequency: monthly to bi-monthly
  • Clean vents and condenser coils: Airflow blockage that reduces cooling performance
    Frequency: seasonally

Frequently Asked Questions

Why is my Delonghi Air Conditioner not cooling?
Common causes include dirty filters, incorrect temperature settings, low refrigerant, and blocked airflow.
How do I fix Delonghi Air Conditioner not cooling myself?
Clean or replace the air filter, verify settings, and ensure vents are clear for optimal airflow.
How much does it cost to fix not cooling?
Professional repairs for not cooling can range from $150 to $800+, depending on the issue.
When should I call a technician for not cooling?
If DIY fixes don't work or if you suspect a refrigerant leak or compressor failure, contact a technician.

References & Sources

Community Analytical Insights

Guidance from available sources; statistical claims are shown only for samples of at least 10 discussions

Common Issues Reported by Users

  • Dirty air filters restricting airflow
  • Low refrigerant levels due to leaks
  • Faulty thermostat not regulating temperature

User Suggested Solutions

  1. Check and replace the air filters. Locate the filter, remove it, and clean or replace it as necessary. Ensure the unit is turned off during this process.

  2. Inspect for refrigerant leaks. If you suspect low refrigerant, contact a professional to check for leaks and recharge the system.

  3. Test the thermostat by adjusting the temperature setting. If it does not respond or is inaccurate, consider replacing it.

Limited-source guidance; percentages and success-rate claims are not shown
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. DeLonghi Penguino PAC EX270LN

Community Discussions

blowing cold air, making noise

Cleaned the condenser and evaporator coils.

DIY View on Reddit →

Source: Reddit r/appliancerepair

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