E4
Chigo
Compressor Discharge Overheat / High-Temperature Protection
Indoor unit displays E4 and the unit stops cooling or heating; compressor may not start.
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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 condenser coil, Failed outdoor fan motor on Chigo condenser, Low refrigerant causing compressor overheating, Faulty discharge temperature sensor on outdoor unit
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before working on the outdoor unit.
- Step 1 – Clean the outdoor coil: Remove debris and gently wash the condenser fins. Ensure at least 30–50 cm clearance around the unit for proper airflow.
- Step 2 – Check outdoor fan: Restore power and run the AC. Confirm the outdoor fan starts with the compressor. If the fan is not spinning or is very slow, test and replace the outdoor fan motor or its capacitor.
- Step 3 – Inspect discharge sensor: With power off, locate the discharge temperature sensor clipped to the compressor discharge line. Check for loose connections or damaged wiring. Replace the discharge temperature sensor if its resistance is out of spec (compare to Chigo service manual values).
- Step 4 – Call a technician for refrigerant issues: If airflow and sensors are fine, a professional should check refrigerant charge and compressor condition.
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Repair Difficulty
Hard
4/5
Required Part
Discharge Temperature Sensor
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