E3
Chigo
Low-Pressure Protection / Refrigerant Undercharge
Indoor unit shows E3 and the compressor stops shortly after starting; outdoor unit may 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 evaporator or outdoor condenser, Loose flare connections on Chigo line set, Blocked indoor filter causing coil freeze and low pressure, Faulty low-pressure sensor on outdoor PCB
How to Fix / Troubleshooting
Safety first: Do not attempt to add refrigerant yourself. Turn off power before inspecting piping.
- Step 1 – Check filters and airflow: Clean indoor filters and ensure nothing blocks the indoor or outdoor units. Poor airflow can cause coil freeze and trigger low-pressure protection.
- Step 2 – Inspect visible piping: Look at the copper lines and flare joints near the indoor and outdoor units for oil stains, which indicate a refrigerant leak.
- Step 3 – Observe icing: If you see ice on the indoor coil or suction line, turn the unit off and let it thaw completely before further use.
- Step 4 – Call a licensed technician: A professional must pressure-test the system, repair any leaks, replace the low-pressure sensor if faulty, and recharge with the correct refrigerant type and weight specified on the Chigo nameplate.
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Repair Difficulty
Professional Required
5/5
Required Part
Low-Pressure Sensor
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