Select a circuit type to begin analysis.
Open when de-energized
Closes when energized
Symbol: —| |—
Closed when de-energized
Opens when energized
Symbol: —|/|—
Series: AND logic
Parallel: OR logic
Mixed: Complex logic
NO CURRENT FLOW: 1 Check power source voltage 2 Verify all series contacts are closed 3 Look for open circuits in wiring 4 Test continuity through each component UNEXPECTED CURRENT: 1 Check for parallel paths (sneak circuits) 2 Verify NC contacts are actually open 3 Look for short circuits 4 Check for voltage backfeed INTERMITTENT OPERATION: 1 Loose connections 2 Contact bounce or chatter 3 Mechanical wear in switches 4 Environmental factors (temp, vibration)