How to Guide

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WIRING OK indicator LED is not illuminated
APC Technical Support
If a problem cannot be resolved contact APC Technical Support.
Telephone 1-888-88APCAV, or visit: www.apcav.com
Probable Cause: There are three reasons why the
WIRING OK 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 these
conditions may affect its surge
protection performance. Contact an
electrician to inspect the building
wiring, or your home wiring, to correct
the problem.