Table
5.
Power
supply
LED
patterns
Name
of
LED
Location
of
LED
Color
of
LED
Status
of
hardware
Action
Power
Uppermost
LED
No
light
(LED
is
off)
The
power
supply
does
not
have
incoming
power.
Ensure
the
following
states:
v
The
power
supply
is
firmly
seated.
v
The
switch
has
incoming
power.
v
Both
power
cables
are
connected.
v
The
ac
power
switches
are
on.
Steady
green
The
power
supply
has
incoming
power
and
is
providing
power
to
the
switch.
No
action
is
required.
Predictive
Failure
Below
the
Power
LED
No
light
(LED
is
off)
The
power
supply
is
either
healthy
or
does
not
have
incoming
power.
Check
the
Power
LED.
Flashing
amber
The
power
supply
is
about
to
fail
because
there
is
a
failing
fan
inside
the
power
supply.
Replace
the
power
supply.
Fail
Below
the
Predictive
Failure
LED
No
light
(LED
is
off)
The
power
supply
is
either
healthy
or
does
not
have
incoming
power.
Check
the
Power
LED.
Steady
amber
Either
the
switch
has
power
but
this
power
supply
does
not
(ac
switch
might
be
off),
or
the
power
supply
has
failed.
Ensure
that
the
correct
ac
power
switch
is
on
and
the
power
supply
is
seated.
If
the
LED
still
displays,
replace
the
power
supply.
Flashing
amber
The
power
supply
is
unable
to
supply
power.
Verify
that
the
incoming
power
meets
the
requirements
listed
in
Chapter
3.
Operating
the
M12
27
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