Electrical issue
Output LED doesn't light (Orange )

Check the power supply AC or DC compliance / wiring 

Verify the intended voltage , max ripple < 10%

Please check the product data sheet 

Inversion of the polarity (DC product)

Reverse the polarity according the product data sheet  
OR 
Change the product

Short circuit protection is actived

Check the load or replace the load by another one with reduced switching power

Cable damaged

Connection cable

Change the product 
OR
the cable for connectic version

Ramdom switching

Electromagnetic disturbances

Move the sensor away from the source of disturbances

Sensing distance is not well defined

Realign the sensor
Apply the correction coefficients

Head blocked / damaged

Check manually the correct head actuation on the complete travel

Replace the head or complete product

Unscrewed lever

Verify the tightening torque of the screw

Please refer to the catalogue data

Contact is blocked / not operating

Verify the mechanical contact changeover

Verifiy the continuity without supply with a multimeter

Replace the contact or the contact body

Bad wiring

Check the screw's terminals tightening torque

Please refer to the catalogue data

check the wiring diagram

Please refer to the product label

Any

Unknown

Please contact technical support for assistance

Any

Unknown

Please contact technical support for assistance

Any

Unknown

Please contact technical support for assistance

Any

Unknown

Please contact technical support for assistance

Any

Unknown

Please contact technical support for assistance

Any

Unknown

Please contact technical support for assistance

Any

Unknown

Please contact technical support for assistance

Any

Unknown

Please contact technical support for assistance