Issues with the humidity control system, also called the humidistat, might also lead to your dehumidifier coil freezing. As stated before, the humidistat is very similar to a thermostat and keeps an eye on the humidity in the room. The electrical contacts of the humidistat are responsible for turning in your humidifier’s compressor.
In the case of humidistat malfunctioning, your compressor stays on as nothing is controlling it. This may help freeze the coils. Alternately, the electrical contacts of the humidistat may also get fused shut; creating the same issue.
If you need to fix this issue, start by disconnecting your dehumidifier from the power supply. Then attempt to turn the humidistat control. If you hear clicking noises, it’s an indication that the humidistat is working correctly.
Moreover, you can also check if your humidity controller is functioning properly with a multimeter. Also, remember while examining the humidistat, the electrical contact circuits should be open. You might have to replace the electrical contacts.