EC
Keystone
Refrigerant System / Sensor Error (Low Refrigerant or Coil Sensor Fault)
Dehumidifier displays EC and stops cooling; fan may still run.
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
Low refrigerant charge due to leak, blocked or dirty evaporator/condenser coils, faulty evaporator temperature sensor, defective main control board interpreting sensor data incorrectly
How to Fix / Troubleshooting
Safety: Unplug the unit before cleaning or inspection. Do not attempt to open the sealed refrigerant system.
Basic troubleshooting for EC:
- Clean filters and coils: Remove and wash the air filter. Vacuum dust from the front evaporator coil and rear condenser coil to restore airflow.
- Check for icing: After running for 15–30 minutes, inspect the evaporator coil. Heavy ice buildup can trigger EC. If iced, unplug and allow to thaw completely, then restart in a warmer room.
- Sensor inspection: Verify the evaporator temperature sensor is firmly attached to the coil and its wiring is intact and connected to the PCB.
- Performance check: If the compressor runs but the air leaving the unit is not cooler/drier than room air, the refrigerant charge may be low or the compressor weak. This requires a certified technician to diagnose and repair.
- Control board: If coils are clean, no icing occurs, and the sensor is good, a faulty main control board may be falsely reporting EC and may need replacement.
Advertisements
Repair Difficulty
Professional Required
5/5
Required Part
Evaporator Temperature Sensor (Coil Thermistor)
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements