Momentary button - troubleshoot using resistance
NO contact: should measure no resistance when button is pressed
NC contact: should measure resistance when button is pressed

Common Component Failure Problems

• Button does not function as it should
  • Check voltage
  • Check wiring
  • Check resistance
  • Verify you are using the correct contact block
    • If not, replace the contact block with a correct one
  • Tabs on contact block are broken or worn
    • Replace the button with a new one
• Failed open or closed 
  • Internal mechanical or electrical failure
    
    • Check continuity

Troubleshooting Instrumentation/Tools

• Multimeter (DC voltage setting)
• Multimeter (resistance setting)
• Multimeter (continuity setting)

Troubleshooting Step-by-Step Example

Additional Troubleshooting Information

Similar Parts:

• Lighted buttons
• Maintained buttons

Schematic for push button: 

Where to Purchase:

Blue Buttons - Automation Direct

Green Buttons - Automation Direct

Red Buttons - Automation Direct

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