E4
SMEG
Discharge Temperature High / Compressor Overheat Protection
E4 code on indoor display; unit stops heating or cooling intermittently
Advertisements
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.
Advertisements
Possible Causes
Blocked outdoor condenser coil, Failing outdoor fan motor, Overcharged refrigerant, Faulty discharge temperature sensor on compressor
How to Fix / Troubleshooting
Safety first: Isolate power before working on the outdoor unit.
- Clean outdoor coil: Remove debris and gently wash the condenser fins. Straighten bent fins with a fin comb if airflow is restricted.
- Check outdoor fan: With power restored, observe if the fan starts immediately when the compressor runs. If it stalls, runs slowly, or is noisy, the fan motor or its capacitor may need replacement.
- Ensure adequate clearance: Maintain clear space around the outdoor unit for proper ventilation.
- Monitor operation: After cleaning, run the unit and see if E4 returns. If it does, the discharge sensor or refrigerant charge may be incorrect.
Overheating issues related to refrigerant charge or sensor replacement should be handled by a qualified technician.
Advertisements
Repair Difficulty
Hard
4/5
Required Part
Compressor Discharge Temperature Sensor
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements