I have a KT3 PAB3 Hartell condensation pump connected to my central AC in the basement. Recently, it seems to run all the time even though there's no water in the reservoir. I cleaned everything inside the reservoir, checked the tube, plugged it back in then it started running again. I filled it up with water, it stopped. I thought it runs when it's full with water and stops when it's empty, but this one does the contrary. Can anybody tell me whether it's broken and can't be fixed or if it's fixable, how. Thanks.