Dehumidifier displays EC and stops removing moisture; fan may still run but compressor does not start.

Safety first: Unplug the dehumidifier before removing any panels. Do not attempt sealed-system (refrigerant) work yourself; that requires EPA-certified service.

Step-by-step checks:

• Power reset: Unplug the unit for 5 minutes, then plug back in and try again. Sometimes EC is a transient sensor communication error.
• Check room conditions: Ensure the room temperature is within the operating range (typically 41–95°F / 5–35°C). Extremely low temperatures can cause sensor and coil issues that trigger EC.
• Inspect the humidity sensor: Remove the front grille and filter. Locate the humidity sensor near the air intake or evaporator coil (small plastic-encased sensor with two wires). Check for corrosion, broken wires, or a loose connector on Frigidaire’s main control board.
• Clean the sensor area: If the sensor is covered in dust or lint, gently clean around it with a soft brush and compressed air. Do not soak the sensor.
• Check wiring harness: Follow the sensor wires to the control board. Reseat the connector firmly. Look for pinched or cut wires along the harness.
• Test operation: Reassemble, plug in, and set the unit to continuous or a low humidity setting (e.g., 35%). If EC returns immediately, the sensor or control board is likely defective.
• When to call a technician: If the sensor and wiring look intact but EC persists, or if the compressor never starts and the coils never get cold, the issue may be a sealed-system or control board failure. Contact an authorized Frigidaire service provider.