How to Bypass the Humidity Sensor on a Dehumidifier


The humidity sensor on a dehumidifier measures the moisture content of air in a room. If the moisture content exceeds a certain level, the sensor signals to dehumidifer motor to activate and begin drawing water vapor from the room. If the sensor malfunctions the dehumidifier may stop working. Running a bypass on the sensor is a quick way to isolate the source of the problem. However, a bypass is not a permanent solution because the dehumidifer runs continuously in bypass mode.

Things You'll Need

  • Screwdriver set
  • 6-inch length of 18-gauge electrical wire
  • Wire strippers
  • Unplug the dehumidifier power cord.

  • Unscrew and remove the back panel on the dehumidifier using a screwdriver. Follow the path of the two wires connected to the switch motor near the bottom, moving upwards to locate the sensor, which is a 1-inch, black cube.

  • Loosen the two screws holding the sensor wires to the switch, using a screwdriver. Each Y-shaped clip pulls out from under the screw head to release.

  • Strip 1/2 inch of insulation from each end of the short lengths of 18-gauge wire.

  • Wrap one end of the wire around a screw terminal and the other end of the wire around the second screw terminal. Tighten both screws.

  • Replace the back panel with the screws and screwdriver.

  • Plug in the dehumidifier. If it begins operating immediately, the sensor is defective.

Tips & Warnings

  • Unplug the dehumidifier to turn of the unit while it is running in bypass. The unit cannot shut off on its own while the sensor is bypassed.

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