A phrase indicating that something is currently broken or out of service; used on notices for machines, equipment, or functions that are not working.
エレベーターは故障中のため、階段をご利用ください。
The elevator is out of service; please use the stairs.
券売機が故障中で、有人窓口で切符を買いました。
The ticket vending machine was out of order, so I bought a ticket at the manned counter.
サイトの一部が故障中で、現在ログインできません。
Part of the site is currently down and you cannot log in right now.