The optimum temp shold be at 38 degrees The compressor will run as needed but should not run all that often as long as door is sealed tight.

I have a feeling it will be turning on every 15 mintues or so if I dial the temp down that low. Its an old DN240 so I cannot find replacement door seals anywhere. It is not torn or anything but it is old and should be replaced. I did put some weatherstripping inside on both sides of the door and that seemed to help it seal a little better. I just don't want it to run all the time and jack up the electric bill.

Thanks for replying guys. Now that I look at it, it looks like a bill validator might not fit. Can anyone tell me the approximate dimensions of these things? I am wondering whether it would hit the door or not when I try and shut it.

Hello I just bought a DNCB240 as well and it wasn't vending when I got it but I got it working by reflowing solder on the logic board in the coin mech itself. This is probably not the problem you are experiencing but I figured I would throw it out there. There is arms that the soda cans themselves will press down to tell the machine that the column has product in it. You need to have about atleast 4 cans in that column so that arm will press down. If you only load two in the arm will be up and the machine will think you are out of product but will take your money and do nothing when the button it pressed. Try loading up a column with 4-6cans and see if that fixes it. As for the use correct change light coming on and going off when the proper credits are reached, I believe mine does that as well. I can check for you if you want.