The Trane Co. recalls

Trane Recalls Air Conditioners after Incidents of Units Smoking

Qingdao Haier Air Conditioner

Hazard: The heating element on these commercially installed units can become displaced and, if it contacts metal, could short circuit. If the electric heater on one of those units short-circuits, wiring problems on 265-volt models could allow the unit to remain energized while the unit's fan is turned off, causing it to overheat and smoke.