EC

Tosot Refrigerant Leak / Low Refrigerant or Sensor-Based Refrigeration Error

Dehumidifier shows EC and stops dehumidifying; fan may still run.

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.

Possible Causes

Low refrigerant charge due to leak in coils or tubing, Blocked capillary or expansion device, Faulty evaporator temperature sensor misreading coil temperature, Control board misinterpreting sensor data

How to Fix / Troubleshooting

Critical safety: Refrigerant handling must be done by certified technicians. Do not attempt to open the sealed system.

User checks:

Coil inspection: With power off, remove the front cover and inspect the evaporator coil. Look for heavy frost only on a small section or oily residue on tubing, which can indicate a leak.
Airflow: Clean filter and coils to ensure proper airflow; poor airflow can mimic low refrigerant symptoms.
Environment: Ensure room temperature is within the operating range; very low temps can cause EC on some models.

Next steps:

If EC persists and the unit is under warranty, contact Tosot support for service or replacement.
A technician can check system pressures, leak-test, and evaluate the evaporator sensor and main control board. In many portable dehumidifiers, sealed system repairs are not cost-effective and the unit is replaced.

Repair Difficulty

Professional Required 5/5

Required Part

Sealed Refrigeration System (Evaporator/Condenser Tubing)

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