Illustrative example
The elevator in a building has been out of service for months. An owner stops paying common charges in protest and the board threatens a lien.
No unit owner may exempt himself from liability for common charges by waiver of the use or enjoyment of the common elements or by abandonment of his unit, and the same logic rules out withholding as a set-off, since non-payment is a way of exempting oneself. The complaint about the board survives; it simply does not license non-payment. So it turns on keeping the two questions apart, not on whether the elevator grievance is fair.
The arrears are cleared over three months and the board commits to a written repair timetable, with a payment into the reserve fund if it slips.