De'Longhi
Heat Pump Heating Failure
De'Longhi air conditioner in HEAT mode blows cold or only slightly warm air.
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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
Reversing valve stuck in cooling position, Low refrigerant charge, Outdoor coil heavily frosted, Faulty outdoor temperature sensor
How to Fix / Troubleshooting
Safety first: Turn off and unplug before inspecting outdoor components.
- 1. Check mode and setpoint: Confirm HEAT mode is selected and the set temperature is above room temperature.
- 2. Inspect outdoor coil: On split or window units, check if the outdoor coil is covered in ice. If so, allow the unit to defrost or run a defrost cycle.
- 3. Listen for reversing valve: When switching between HEAT and COOL, listen for a click or change in refrigerant flow. No change may indicate a stuck valve or failed coil.
- 4. Technician service: Heating failures usually require a technician to test the reversing valve coil, refrigerant charge, and outdoor sensor.
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Repair Difficulty
Professional Required
5/5
Required Part
Reversing Valve
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