Upon arrival, there is a wet spot below the humidifier. Inspect internal cabinet of the geothermal unit and see no water. Remove humidifier door and there is water that has been sucked off the humidifier pad. Humidifier fan speed is set to high. Change fan speed to low and perform test run to check for a continued leak. With low fan setting, water is still being sucked off of the humidifier pad due to a dirty/clogged humidifier pad. Although only approximately 5 months of humidifier operation, excessive build up is most likely due to the humidifier being set to 60% humidity, aswell as the longer and colder winter we have had this year. Other contributions could be water quality aswell as air quality. A dirty humidifier pad is not the responsibility of Westin Air as it is a regular maintenance item. Although April air recommends changing it every 12 months, the above mentioned operating condition can necessitate changing the humidifier pad earlier than the 12 months.