Display shows EC and the unit stops cooling/dehumidifying.

Safety warning: Do not attempt to open the sealed refrigerant system. Only certified technicians should handle refrigerant. You can, however, check airflow and sensors.

Steps:

• Inspect for icing: Turn off the unit and remove the front cover. Look at the evaporator coil. If it is covered in ice, allow it to fully defrost (this may take several hours).
• Clean filter and coil: Wash the air filter and gently clean dust from the evaporator fins with a soft brush. Ensure nothing blocks the air intake or discharge.
• Check fan operation: Confirm that the indoor fan runs at normal speed. Poor airflow can cause coil temperature faults.
• Sensor check: Verify that the evaporator NTC sensor is firmly attached to the coil and its wiring is intact. Replace the Argo evaporator NTC temperature sensor if readings are abnormal.
• Test again: After defrosting and cleaning, run the unit. If EC returns quickly and the coil does not get uniformly cold, the refrigerant charge may be low.
• Professional service: Contact an authorized Argo refrigeration technician to check for leaks, repair the sealed system, and recharge refrigerant if necessary.