For commercial units, partstown.com or 3wire.com (in resources)
motherboard circuit
Blower circuit board is shot
The resistor is located on a small circuit board close to the blower, it can be seen by removing the glove compartment.
Blower motor resistor is bad. It is a little circuit board with resistors on it that changes voltage to the blower motor. When it goes bad, you get full speed only.
Fan speeds are usually controlled by a series of resistors on a circuit board. When some speeds don't work, it means that you have to replace that little circuit board. FriPilot
The furnace control board wiring diagram shows how the various components of the furnace are connected to the control board. It includes details on the wiring connections for the thermostat, blower motor, gas valve, and other important parts of the furnace system. Understanding this diagram is crucial for troubleshooting and repairing furnace issues.
The main circuit board of the computer is the motherboard.
is the main printed circuit board (PCB)
The blower motor resistor circuit board has gone bad. Replace the blower motor resistor. I did Still dont work Try the fuses...Had the same problem and it was a blown fuse.
rigid-flex circuit board
Circuit board kits vary in cost depending on what type of circuit board you are building. You can buy circuit board kits from Amazon starting at $35.00. There are many other options out there as well.
printed circuit board printed circuit board