My furnace (non heat pump) had been making popping sounds and I found that the front cover had only 6 screws holding it on and metal tape sealing the edges. The tape split leaving the corners lifted and thus allowing more air (and dirt?) in so I temporarily retaped (at midnight) it and all was quiet. I had planned on opening it up in the morning to clean and before I got to it, I noticed it seemed to be short cycling. Upon inspection, I found that the coils were frozen up. This seems normal for summer time maybe with low freon etc but not in winter during the heat cycle. What gives?:confused:
