Dehumidifier displays E3 and compressor does not run or cycles off quickly.

Safety first: Unplug the unit before removing covers or touching internal components.

Steps to correct E3:

• Access the evaporator: Remove the front or rear panel (depending on model) to expose the evaporator coil (cold coil). The evaporator sensor is usually clipped or taped to the coil tubing.
• Check sensor placement: Ensure the sensor is firmly attached to the coil surface. If it has fallen off, reattach it using the original clip or aluminum tape so it makes good thermal contact.
• Inspect wiring: Follow the sensor wires back to the main control board. Look for chafing, cuts, or loose connectors. Repair or secure as needed.
• Measure resistance: Disconnect the sensor and measure its resistance at room temperature. Compare to the expected NTC value (often similar to the ambient sensor). A reading of 0 Ω or infinite indicates a defective sensor.
• Replace sensor: If resistance is out of spec or intermittent when the sensor is gently flexed, replace the evaporator temperature sensor.
• Control board diagnosis: If a new sensor and good wiring still result in E3, the main control board is likely at fault and should be replaced.

Warning: Avoid bending or puncturing the refrigerant tubing on the evaporator coil. Damaging the sealed system requires professional repair.