It is used for adjusting the heat level to make it a higher or lower setting. There are 5 heat settings on a Hudson River control board (panel). It is also used to adjust the intensity of the room fan. If you want to heat a large house or large room, adjusting the heat and room fan to higher setting helps direct the heat throughout the space. If you want to heat a smaller house or a single room, lowering the fan or heat settings limits the heat to that area and conserves energy. This is also where the on and off buttons are located on the pellet stove.
The "DHC 3000 Generation II has a horizontal slide switch on the front and only one fuse. The new updated board has all of the above but the buttons are framed and the lights have a different color tone.
If the original control panel # 2 light blinks after approx 5-10 mins and the updated control panel # 2 heat level light blinks almost right away and the vacuum switch, hose and door and ash pan gaskets are good, the control panel is bad and this new control panel will fix the problem. Remember always plug the stove into a good surge protector like this one.
The 70k BTU Hudson River West Point should have the Control Board Jumper on Pins 2-3
The 50K BTU Hudson River Saranac Jumper on pins 3-4