Recently had the defrost switch replaced because the freezer was not defrosting. Once replaced, started to notice that the back panel of the freezer that covers the coils heats up to the point that you can't touch it. When the fan turns back on, hot air blows and starts to defrost some of the items in the freezer. Is it possible that the new defrost switch is causing the heating coil to heat hotter than previously? The defrost timer was not changed. It reads 10h 30 min.