How to Replace a Dehumidifier Sensor Assembly

 

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This DIY repair guide explains how to replace the sensor assembly in a dehumidifier. The sensor assembly includes the humidistat; the evaporator thermistor; and the wire harness and connectors that attach to the collection bucket float switch and electronic control board. The humidistat and evaporator thermistor sense humidity and evaporator temperatures respectively, and send signals to the electronic control board. If the dehumidifier won't cycle correctly because of a malfunctioning sensor assembly, replace the assembly with the manufacturer-approved replacement part.

Repair difficulty:
     
Time required:

Less than 45 min.

Parts Required

  • Sensor assembly

For manuals, repair guides, and specific part recommendations, enter your model number.

Tools Required

  • Phillips screwdriver
  • Work gloves

Before you begin

Wear work gloves to protect your hands.

Instructions

 Warning: Undertaking repairs to appliances can be hazardous. Use the proper tools and safety equipment noted in the guide and follow all instructions. Do not proceed until you are confident that you understand all of the steps and are capable of completing the repair. Some repairs should only be performed by a qualified technician.

Step 1: Disconnect power

Unplug the power cord from the wall outlet.

Step 2: Remove the collection bucket

Pull the water collection bucket out of the front of the dehumidifier case.

Step 3: Remove the air filter

Pull the air filter out of the bottom of the front grill.

 Tip: Clean the air filter if it’s dirty.

Step 4: Remove the front grill

Remove the 2 screws at the bottom of the front grill that secure it to the frame.

Lift the front grill carefully up and off of the front of the frame and set the front grill down in front of the dehumidifier.  The wire harness for the user interface control board is still attached on the back of the front grill. Keep the front grill directly in front of the dehumidifier to avoid damaging the user interface control board wire harness.

Step 5: Remove the back panel

Remove the screws that secure the back panel to the dehumidifier.

Carefully pry out a bottom corner of the back panel and pull the back panel off of the dehumidifier.

Step 6: Remove the outer case

Remove the screws that secure the outer case to the humidifier.

Pull the outer case off the dehumidifier.

Step 7: Remove the sensor

Disconnect the sensor wire harness from the electronic control board.

Pull the wire harness off of the collection bucket float switch.

Pull the evaporator thermistor out of the copper sleeve on the side of the evaporator coil.

Remove the humidity sensor from the evaporator fins. 

Pull the sensor assembly out of the dehumidifier.

 

Step 8: Install the new sensor

Push the humidity sensor into place on the front of the evaporator fins. 

Install the evaporator thermistor inside the copper sleeve on the evaporator.

Connect the wire harness to the collection bucket float switch.

Plug the wire harness for the sensor into the electronic control board.

Step 9: Reassemble the dehumidifier

Position the outer case on the dehumidifier and secure it using the mounting screws.

Reinstall the back panel on the dehumidifier and secure it with the mounting screws.

Place the front grill on the dehumidifier and secure it with the mounting screws.

Push the filter back onto the front grill.

Reinstall the collection bucket in the front of the dehumidifier.

Step 10: Restore power

Plug the dehumidifier back into the wall outlet.