Every month you break out the checkbook to pay your maintenance fees for your co-op. Naturally you expect that those fees go toward maintaining the upkeep of your residence. But for whatever reason, something goes wrong. It can be an infestation, no heat or running water, mold, or some odd fumes that makes the unit unlivable. In cases where you can no longer live comfortably in the unit, the warranty of habitability may have been breached, and there could repercussions for the board.