Fault finding is the investigation of the cause of malfunction in machinery, especially electronic equipment.

Standard/Fundamental Faults

The following is a concise list of typical faults that are the most common causes of a circuit ceasing to operate correctly:

• Loss of supply
• Earth fault
• Dead short
• Correct protective device in place
• Defective components
• Breakdown of control circuits
• Reversed polarity
• Initial faults on newly installed work
• Phase rotation