E3
Haier
Low-Pressure Protection / Refrigerant Undercharge or Flow Restriction
Indoor display shows E3 and the unit stops cooling or heating; may run briefly then shut down.
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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
Refrigerant leak in indoor or outdoor coil, Blocked capillary or expansion device, Clogged filter drier, Severely dirty evaporator or condenser reducing heat exchange
How to Fix / Troubleshooting
Safety first: Disconnect power at the breaker. Do not attempt to open refrigerant lines without proper certification and tools.
- Visual inspection for leaks: Look for oil stains on flare joints, service valves, and around the indoor and outdoor coils. Oil residue often indicates a refrigerant leak.
- Check coils and filters: Ensure both indoor and outdoor coils are clean and filters are washed. Poor airflow can mimic low-pressure conditions.
- Listen for hissing: With the unit briefly powered, listen for unusual hissing at joints that may indicate an active leak (then power off again).
- Professional service: If E3 remains, a technician must locate and repair leaks, evacuate the system, replace the filter drier if applicable, and recharge with the correct Haier-specified refrigerant type and weight.
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Repair Difficulty
Professional Required
5/5
Required Part
Refrigerant Circuit (Coils and Piping)
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