When you test it and turn on the fan switch, with or without pellets burning, the fan turns slow and even on clean setting does not speed up. The fan runs for about 10-20 seconds and the unit shuts down and the red flue/overheat light starts flashing. Cleaned all sensors, I disassembled, cleaned both the fan and auger and installed new brushes. I tested them before installing and worked fine. And I still have the same results . I'm thinking either the fan switch or the circuit board this is a 96 vintage stove.