Because garage doors are the largest moving objects in our homes, safety should be the primary focus of maintenance and repair of door and operator systems. Auto-Reverse Mechanism: All garage door operators(openers) sold since 1993 have legally required auto-reverse mechanisms. Older operators lacking these features should be replaced. In some jurisdictions it is unlawful to repair an operator that doesn't comply with UL325 (doesn't include and auto-reverse mechanism). Even where replacement isn't mandated by law, such operators should be replaced for safety and because their age make them difficult and costly to repair.