January 1, 2014

How to replace a dehumidifier sensor assembly

By Lyle Weischwill
How to replace a dehumidifier sensor assembly

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.

Use this repair procedure to replace the sensor assembly in Kenmore and LG dehumidifiers.

Quick links
Tools required
Phillips screwdriver
Work gloves
Repair difficulty
Time required
45 minutes or less
Repair difficulty
Time required
45 minutes or less

Instructions

01.

Disconnect power

Unplug the power cord from the wall outlet.

02.

Remove the collection bucket

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

Remove the collection bucket.

Remove the collection bucket.

03.

Remove the air filter

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

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

Remove the air filter.

04.

Remove the front grille

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

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

Remove the screws.

Remove the screws.

Pull the front grille up and off.

Pull the front grille up and off.

05.

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.

Remove the screws holding back panel.

Remove the screws holding back panel.

Remove the back panel.

Remove the back panel.

06.

Remove the outer case

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

Pull the outer case off the dehumidifier.

Remove the side screws.

Remove the side screws.

Remove the front screws.

Remove the front screws.

Remove the screw from the control box.

Remove the screw from the control box.

Remove the outer case from the dehumidifier.

Remove the outer case from the dehumidifier.

07.

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.

Disconnect the wire harness from the electronic control board.

Disconnect the wire harness from the electronic control board.

Disconnect the wire harness from the collection bucket float switch.

Disconnect the wire harness from the collection bucket float switch.

Pull the thermistor out of the evaporator.

Pull the thermistor out of the evaporator.

Pull the humidity sensor off of the evaporator.

Pull the humidity sensor off of the evaporator.

Pull the sensor assembly out.

Pull the sensor assembly out.

08.

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.

09.

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 grille on the dehumidifier and secure it with the mounting screws.

Push the filter back onto the front grille.

Reinstall the collection bucket in the front of the dehumidifier.

10.

Restore power

Plug the dehumidifier back into the wall outlet.

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.
Symptoms common to all dehumidifiers

Choose a symptom to see related dehumidifier repairs.

Main causes: weak or dead batteries, out of range, radio frequency interference
Main causes: lack of electrical power, wiring failure, electronic control board failure, user interface control failure
Main causes: collection bucket not installed, collection bucket full of water
Main causes: loose fan motor mounting screws, loose compressor mounting bracket screws, bad fan, faulty compressor
Main causes: dirty air filter, clogged grill, dehumidifier placed too close to the wall, dehumidifier too small for the space
Main causes: clogged drain hose, drain hose not properly connected
Main causes: dehumidifier too small for the space, bad humidity sensor, faulty evaporator thermistor, low refrigerant, bad compressor
Main causes: collection bucket not installed correctly, cracked collection bucket, loose drain hose connection
Main causes: room temperature below 65 degrees Fahrenheit, control system failure
Repair guides common to all dehumidifiers

These step-by-step repair guides will help you safely fix what’s broken on your dehumidifier.

How to replace a dehumidifier electronic control board

If the dehumidifier won’t power up because the control board has failed, use the steps in this repair guide to replace the electronic control board and fix your dehumidifier.

Repair difficulty
Time required
 45 minutes or less
January 1, 2014
By Lyle Weischwill
How to replace a dehumidifier sensor assembly

If the humidifier sensor doesn’t properly detect humidity or evaporator temperature, install a new sensor assembly, following these steps.

Repair difficulty
Time required
 45 minutes or less
How to replace a dehumidifier user interface control board

If the dehumidifier doesn’t respond when you try to set it, follow these steps to replace it.

Repair difficulty
Time required
 30 minutes or less
Articles and videos common to all dehumidifiers

Use the advice and tips in these articles to get the most out of your dehumidifier.

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