VacuMaid Circuit Board for S-2000, S-2600, P125 & P-110 Central Vacuums

PC120ST is a replacement control board for a VacuMaid central vacuum power unit, the small printed circuit assembly that reads the low-voltage loop coming from the wall inlets and hose-end switch and converts that signal into start and stop commands for the motor. It sits between the household wiring and the relay or contactor that actually carries the motor's current.

A board on the way out tends to fail at the power unit rather than at any single inlet: the system will not start from any location, it starts but refuses to stop, or it answers inconsistently no matter which hose or inlet is used. Because a bad relay, a pinched low-voltage wire, or a worn hose-end switch can all mimic these same symptoms, it is worth confirming a signal actually reaches the board's terminals before ordering a replacement, something a multimeter check settles in a few minutes at the terminal block.

Fitting a new PC120ST returns full start and stop control without altering any of the existing low-voltage wiring already run through the house, and the swap itself is limited to the board's mounting screws and its wiring plugs.

• Part: PC120ST control board
• Function: reads the low-voltage inlet signal and controls motor start/stop
• Covers: VacuMaid units in the S-2000, S-2600, P125 and P-110 model lines, with fit varying by production date and motor

This is a functional replacement matched to the original board's electrical behavior rather than a board pulled from a running unit, so it will not carry any original casting markings, and it should be matched carefully against the existing board's connector layout before wiring it in.