How to Fix / Troubleshooting

Safety first: Unplug the dehumidifier before opening the control panel area.

Steps to resolve E3:

Power cycle: Unplug for 5 minutes, then plug back in and test. If E3 reappears, proceed to inspection.
Locate humidity sensor: On many Whynter units, the humidity sensor is mounted near the air intake grille or on the control panel board, often in a small plastic housing with vents.
Check connection: Ensure the sensor's plug is firmly seated on the control board. Gently disconnect and reconnect it.
Clean sensor area: Use compressed air or a soft brush to remove dust from the sensor housing. Do not spray liquids directly on the sensor.
Test operation: Reassemble the panel, plug in, and run the unit. If E3 persists, the humidity sensor module likely needs replacement.

Note: A failed humidity sensor can cause incorrect humidity readings or prevent the unit from cycling properly.

Dehumidifier displays E3 and shuts down or fails to start

Possible Causes