APC H10 User Manual

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“Wiring OK Indicator” LED is not illuminated.
Probable Cause:  
There are 3 reasons why this LED would not be 
illuminated:
1.  Reversed polarity exists at the wall outlet.
2.  Neutral wire is overloaded.
3.  Earth ground is missing at the wall outlet.
Solution:  Operating the unit under such conditions may impact its surge 
protection performance.  Contact an electrician to have them inspect the 
building or home wiring to fix the problem.
Probable Cause:  Unit is on but LEDs are turned off.
Solution:  Push the Setup button, push the Select button two or three times. 
The LEDs should illuminate.  Choose the dimmer setting (see the sections 
on “Front and Rear Panels” and “Setup the H10”).