The answer to 'dehumidifier short cycling' is that a dehumidifier short cycling, or turning on and off frequently, is often caused by issues with the unit's controls, airflow, or sizing. Common causes include a dirty air filter, blocked air vents, a malfunctioning humidistat, or a dehumidifier that is too large for the space. This can lead to the unit not running long enough to properly remove moisture from the air.
To fix short cycling, first check the air filter and clean or replace it if needed. Make sure there is adequate airflow around the unit and that vents or registers are not blocked. If the humidistat is faulty, it may need to be repaired or replaced by a professional HVAC technician. In some cases, the dehumidifier may simply be the wrong size for the room and need to be replaced with a properly sized unit.