Inexpensive dehumidifiers commonly malfunction when temperatures dip below 65 degrees Fahrenheit. Other common problems include a burned out fan motor and a faulty refrigeration system.
A dehumidifier can only function at or above its minimum operating temperature. Unmarked models freeze over at temperatures below 65 F, while more expensive low temperature models can function in colder environments. Burnt out fan motors and malfunctioning refrigeration systems are more serious problems that require a trained technician to repair. Routine maintenance prevents and resolves other common problems, including frozen coils, dirty air filters and a filled water tank. However, a water tank that fills up on a daily basis is indicative of an environmental problem, such as a broken water pipe or open crawl space in the room.