I had a new Carrier furnace & A/C installed in June of 2004. The model # on the furnace is 58CTA090-14. I returned home from a fishing trip today to temps of 95 degrees. (My wife and teenage son were home while I was gone.) When I walked in the house felt a little warm and clammy. I checked the thermostat, it was set at 77 but the temperature in the house was 79. When I looked at the furnace I noticed that I didn't see the filter in the slot. I took off the return that's in line with the filter and noticed that the filter was partially sucked into the fan, although the fan was able to run. When I pulled the filter out it was wet, but came out all in one piece. There was a little water on the floor around the furnace. I found out that my son had tried to do a good deed while I was gone, and had replaced the filter for me, but he had put it in backwards, with the air flow arrow pointing in the wrong direction. I replaced the filter, and the temperature in the house came down to 77 in a short time. The mugginess also was removed. However, I noticed that when the outside condenser and fan shut off I could still hear something running. I removed the cover on the furnace and saw what looks like a clock spring (have no idea what it really is or what it's for) continuing to spin. I don't recall hearing this running before. Is this normal, or do I have a problem? I noticed a round glass window on the front of the furnace, and I see an amber/yellow light flashing. There are 2 short flashes, then 1 longer flash. A pause, then it repeats. Any help would be appreciated. Thanks.