故障中だ

be out of order

→ 故障
phrase Rare #36,482
be out of order Used to say that a machine, device, or system is currently broken or malfunctioning. 故障中 is commonly seen on signs and labels; だ makes it a plain-style statement.
JA: このエレベーターは故障中だ。
EN: This elevator is out of order.

故障中だ

Out of order.

— フォーリング・ダウン (1993)

この電話は故障中だ

This phone is out of order.

この機械は故障中だ

This machine is out of order.

電話は今故障中だ

The phone is out of order right now.