Learn what it takes to replace the circuit board in your main central vacuum collection unit while saving a lot of money. A central vacuum circuit board has gone bad when you don't hear a "click" sound at the tank when trying to start the vacuum. The difficulty level to change the board is "easy-medium" and usually takes a half hour. We sell the electrical components for this upgrade here at Central Vacuum Online.


(It is recommended to have a professional perform this procedure.)
  1. WIRING
    Unplug the vacuum power source. Typically, the new board will replace the old board wire for wire. Each connection on the board has a marking. They are as follows:
    1. “LINE”: Power hot coming in from the power cord (black wire)
    2. “NTL”: Power neutral coming in from the power cord (white)
    3. “MOTOR”: Each vacuum motor will have two connections on the board and both may be labeled “MOTOR”. Since vacuum motors are polar neutral it doesn’t matter which motor wire goes to which motor board connection.
    4. The low voltage wires from the home will attach to the two connectors inside the black tower part of the board. It doesn’t matter which wire goes to which side.
    5. The yellow wires attached to the board are low voltage. They can ignored be or go to an on/off switch on the side of the tank.


  2. SECURING
    Circuit boards are secured inside the vacuum by nuts on the exterior of the tank. The mini-breaker and low voltage connection tower come with nuts that screw down and secure the board to the inside of the vacuum from the exterior of the tank.
    1. If these two holes do not align with holes on the vacuum tank a new hole will have to be made. We suggest using a small drill to drill out the outline of a circle.
    2. If the low voltage tower (black with two connections) is not needed on your vacuum it can be hack-sawed off. The board will be secure with just the minibreaker connection.


  3. TESTING
    1. The board should work just like the previous set up.
    2. Test using a hose in the home or using the on/off switch on the tank if present.
    3. If the system doesn’t start, be sure the vacuum is plugged in.
    4. For more troubleshooting further give us a call.