Turn the control dial to the "Max" position and ensure the power cord is plugged in. Don't use an extension cord or plug adapter with the dehumidifier, as it might not be rated to carry the required electrical current. Check the fuses or breakers if the outlet doesn't seem to work.
Empty the moisture bucket if the "Full" light glows on the control panel. The dehumidifier collects moisture from the air in a plastic container for easy disposal. Empty the bucket in a sink and return to the dehumidifier. The light should go off and the appliance should come back on. Make sure the float that hangs inside the water bucket is free to move up and down.
Pinch the plastic tabs above the front grille at the top of the dehumidifier. Lift out the air filter and brush any dust into the garbage before sliding the screen back in place. A dirty air filter strains the appliance and reduces its efficiency.
Ensure there is at least 10 inches of clearance on all sides of the dehumidifier; curtains, couches and other large furniture can block the air flow around the appliance and prevent it from working correctly. Close all windows and doors in the room while the dehumidifier is running.