Nadair Central Vacuum Circuit Board for Models 60018, 70025, 70035

A dead central vacuum that still hums or clicks at the breaker but ignores every wall inlet points at the control board before anything else, and this board is Nadair's replacement part for that failure on the 60018, 70025, and 70035 power units. It carries the low-voltage logic that watches the inlet and remote circuits and fires the motor relay when a hose goes in.

Diagnosing the board versus the motor is usually simple: if the unit runs when you jump the low-voltage terminals directly but never starts from a wall inlet, the board has failed rather than the motor. If the unit does not run even with the terminals jumped, the fault is more likely downstream in the motor or its wiring, and this board will not fix it. That distinction matters because the board costs a fraction of a replacement power unit, and the swap takes minutes once the canister is open and unplugged.

Set the new board beside the failing one before installing. A mismatched connector count or mounting hole pattern is the sign to double-check the part number rather than force the fit. Snap a photo of the existing wiring before removing anything as a reference for reassembly.

Confirm the unit is unplugged before opening the canister, and reinstall the cover securely once wiring is complete to keep dust out of the control compartment.

• Part: 6114-19C2, fits Nadair 60018, 70025, 70035
• Quick test: unit runs on jumped low-voltage terminals but not from inlets, board has failed
• Function: low-voltage control, motor relay switching
• Install note: confirm connector count and hole pattern match before swapping