This control board plug is for the new style control board now being used on large and small PS/PI units that have the old style wiring harness. With this plug in place on the control board the diagnostic features will "NOT" be available due to the limitations of old style harness on the unit. This plug will however allow the new board to work on a unit with this old style harness.

****NOTE**** NOT USED ON THE AGP PELLET UNITS