If neither of the preceding checks identify the problem, move on to plugging the smoker cabinet directly in to a working outlet. This will require a computer style cord. If the heating element in the smoker starts to warm up, this indicates the problem is in the smoker generator. Since you heard buzzing from the circuit board, at this point, I’d replace the circuit board.
If the heating element doesn’t heat up, the problem is in the smoker cabinet. The first thing I would check is the thermal fuse in the red wire inside the back wall of the smoker. I’d test that by using a jumper wire to bypass the thermal fuse. If the heating element starts to warm up using the jumper, you’ve identified your problem. Replace the wire with the thermal fuse. This wire was less than $10 when I replaced one a few years ago. As long as you’re getting one, get a spare.
