E3
Daikin
High-Pressure Protection
Daikin system stops with E3; may occur during cooling or heating under heavy load
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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
Blocked outdoor coil, Inoperative outdoor fan motor, Overcharged refrigerant, Non-condensable gas in system
How to Fix / Troubleshooting
Safety first: Turn off power before cleaning the outdoor unit. Refrigerant adjustments must be done by a licensed technician.
User steps:
- Inspect the outdoor unit coil fins; remove leaves, plastic bags, and dirt with a soft brush or low-pressure water from inside out.
- Ensure there is at least the minimum clearance around the outdoor unit as specified by Daikin (no walls or plants blocking airflow).
Technician tasks:
- Check outdoor fan motor operation and replace if not running.
- Measure system pressures and compare with expected values.
- Recover and weigh refrigerant if overcharge is suspected; evacuate and recharge to factory-specified weight.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Fan Motor or Outdoor Coil
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