Dehumidifier: Runs all the time

If the dehumidifier runs continually and constantly collects water, it's likely that the dehumidifier's capacity is too low for the space; add another dehumidifier to the space to increase the water-collection capacity. A defective humidity sensor can also cause the dehumidifier to run constantly. If the evaporator is iced up and not defrosting, you may need to replace the evaporator thermistor-the dehumidifier won't collect water if the evaporator is iced up. If you see no frost on the evaporator while the dehumidifier is running, and the dehumidifier isn't collecting water, the dehumidifier may be low on refrigerant or the compressor may be defective. See the repairs below for ways to correct the problem.

dehumidifier

These repairs may help solve your dehumidifier problem

Replace the dehumidifier evaporator thermistor

Replace the dehumidifier evaporator thermistor

The evaporator thermistor is a temperature sensor on the evaporator coils. It communicates the temperature of the evaporator coil to the electronic control board; if the temperature is too low, the electronic control board detects excessive frost and begins the defrost cycle. If the thermistor isn't working properly, the electronic control won't defrost the coils. Replace the evaporator thermistor if it doesn't detect the evaporator temperature.

January 1, 2014
By Lyle Weischwill
How to replace a dehumidifier sensor assembly

If your dehumidifier's bucket isn't filling with water, the sensor assembly might be the problem. This DIY repair guide has clear, step-by-step instructions that explain how to replace a dehumidifier sensor assembly.

Repair difficulty
Time required
 45 minutes or less
Read more
Replace the dehumidifier humidistat

Replace the dehumidifier humidistat

The humidistat is a sensor on the front of the evaporator coil that monitors the humidity of the room air being pulled in through the evaporator. The humidistat communicates the humidity to the electronic control board through a wire harness connection. If the thermistor is defective, the electronic control won't properly detect humidity and dehumidify the room. Replace the humidistat if it doesn't sense the humidity.

January 1, 2014
By Lyle Weischwill
How to replace a dehumidifier sensor assembly

If your dehumidifier's bucket isn't filling with water, the sensor assembly might be the problem. This DIY repair guide has clear, step-by-step instructions that explain how to replace a dehumidifier sensor assembly.

Repair difficulty
Time required
 45 minutes or less
Read more
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.

January 6, 2015
Dehumidifier doesn't collect water
By Sears PartsDirect staff

Why your dehumidifier doesn't collect water and how to resolve the problem.

December 22, 2014
How does a dehumidifier work?
By Sears PartsDirect staff

Discover how a dehumidifier works.

December 16, 2014
How to clean a dehumidifier
By Sears PartsDirect staff

How to clean a dehumidifier for more efficient operation.