In what scenario should you put an out-of-order sign on a machine?

Placing an out-of-order sign on a machine is essential to ensure safety and prevent accidents. It indicates that the machine is not functioning properly and should not be used until it has been repaired or deemed safe for operation. This action protects users from the risk of injury that could occur from trying to operate a defective machine.

In contrast, a machine requiring maintenance may still be operational and safe to use, whereas improper use is not a valid reason for labeling it out-of-order. Additionally, simply being old does not necessarily render a machine out-of-order; age alone does not indicate operational status unless it leads to defects or failures. Using an out-of-order sign specifically addresses scenarios where the machine is defective and poses a hazard to its users.