I posted this in the wrong section before maybe someone here can help me. I have a problem with a walk in freezer. The evap coils keeps freezing up, about 1-2" a week. The front freezes up really bad with soft ice on top and solid ice on the bottom. The back freezes up just on top. During the defrost when the arm first hits the pin, nothing happens. The pump down doesnt start until the second click, by then there is about 10 - 20 minutes left on the defrost. The defrost is set to 60 minutes. The heaters only stay on for a couple minutes after that. I've replaced timers before, but I dont know the actual sequence and what the terminals are associated with. Any help would be great.