Mastertemp 250 starts and runs for several hours then quits. No led lights, control board dark. On restart the next day it starts normally until it goes dark. Turning breaker on and off does nothing. Manufacturer troubleshooting guides don't lead to a solution. Since it will restart some time later I wonder if a component eventually gets warm enough to kill power to the system. No LED on ignition control or control panel.

Any thoughts or prior experience appreciated.