Question
System starts and runs properly at programmed time.
It has run properly for 2-3 years.

Now, it unexpectedly turns on shortly after midnight.

Why? How can I fix this.

Answer
Hey James, make sure that you do not have a second, third, or fourth start time scheduled in on start times. Also go through your b and c programs and make sure you do not have something scheduled into these programs. If you have a start time scheduled in on the second, third, or fourth start time, simply hold down the + button and the - button at the same time, and it will clear that time out. Good luck and have a great day.