It's not a malfunctioning pad, it's a crappy thermostat. I suggest getting a better one. I use two of these. http://www.amazon.com/Hydrofarm-MTPR...9902064&sr=8-1 For such a cheap thermostat that work okay....to the point where the temps are staying where I set them at. If you want a better quality one let me know I can give you some suggestions.