Just tried out my replacement and it's a dud too. Different wood than the original,gap on top/bottom of battery door and it somehow weighs about 3 times as much as the first one I had. It was in temp mode out of the box with no tank attached. I put my Subtank Plus on it with a 1.5 OCC and it still said it was in temp mode and showed 0.00 res. I went into the menu to read the res and it started to auto fire on me. I had to remove the tank and noticed it was out of temp mode now so I tried again. Stuck the same tank on it,no res,checked res and auto fire. This thing is a piece of junk.