My husband replaced the evaporator drain tube heater a couple days ago. Since it's been back up and running, the temperature is holding at 0 degrees but the compressor never seems to stop running. He turned the dial down to 5 and it did shut off, but after about 20-30 seconds the compressor kicked on again. Could he have caused another problem by replacing the drain tube heater? Another thing he noticed is that the fan shuts off when the door is open and restarts when it's closed. I don't recall if this happened before or no, but he says no. The drain tube heater was bad for a couple years, to the point where we had to pull the hose and let the water drip into a bucket or it would just ruin everything in the back of the freezer and we'd end up with a giant iceberg. It's been three days and the new one seems to be doing what it's supposed to. He's convinced that he messed the freezer up by replacing the drain tube heater himself. I didn't think the drain tube heater would make the compressor keep running, but I don't know anything about freezers. Any help would be appreciated. Our ice cream parlor opens a week from today and we're not sure what to do. Thanks!

Freezers - True - T23F Freezer