Cleaning the filters was the first thing I tried. We were out of town for a few and days and when we returned last night, I noticed the concrete was wet at the corner of the heater. So I took off the panel and there was a small puddle on the bottom. The bottom of the drain plug was wet but was not dripping straight down; it seemed to be running underneath towards the heater and dripping inside. I took some pictures but not sure how well anyone can see the moisture. Could something as simple as a new drain plug for the heater solve my problem?