After spending weeks replacing parts and talking to BUNN technical support, we finally have the solution to the NO CHILL mode problem. Even through ICE mode always worked, the machine would never chill. BUNN technical documents say the torque sensor board is not used for chill mode, but that's not true! Hidden deep in the firmware, anytime the TSB senses "7" or higher, it will kick the unit out of chill mode. This means if you have a warn spring on your auger shaft, you will never chill in nighttime mode, and the compressor will still cycle on/off and waste electricity, yet not chill. With no liquid in, you should get a TSB reading of 0, 1, or 2 -- anything higher and you might have a problem.
