I have a Quadra Fire 1200i. Had to replace the control box because it bumped and shorted out. With the new control box on the, when the tstat is set to call for heat the blue light inside the control box comes on and the red heat light comes on. The combustion blower comes on for few seconds, then the exhaust blower comes on for few seconds and stops, then the exhaust blower comes for a few seconds and stops. The stove will continue to go through cycle. The stove does not go the cycles of lighting the stove.