De'Longhi
Loss of Cooling Capacity with Running Compressor
Unit blows warm air in COOL mode; compressor appears to run.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Severe refrigerant leak, Blocked capillary tube or expansion device, Non-condensable gases in system, Failed four-way valve stuck in heating position (heat pump models)
How to Fix / Troubleshooting
Important: These are sealed system issues that require a certified technician.
- 1. Confirm mode: Ensure the unit is actually in COOL mode and not HEAT or FAN.
- 2. Check condenser temperature: Carefully feel near the rear or outdoor coil (without touching moving parts). It should be warm/hot in COOL mode. If it is not, the refrigerant circuit may not be functioning correctly.
- 3. Look for oil stains: Inspect copper tubing and joints for oily residue indicating a leak.
- 4. Technician service: Do not attempt to open the refrigerant circuit. A technician must locate leaks, evacuate, and recharge the system or replace faulty components.
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Repair Difficulty
Professional Required
5/5
Required Part
Capillary Tube / Expansion Device
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