Translation

• malfunction
• breakdown
• defect
• shortcoming
• fault
• failure
• impediment
• error
• bug (in software)

Examples

• 电梯好像故障了。
  The elevator seems to be out of order.
• 机器结构很复杂，我们找来找去也找不到故障的原因。
  The machine was too complicated for us to find out the cause of the trouble.