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Troubleshooting
The charts on pages C-3 to C-8 describe various problems that can occur, possible causes for
each problem, and procedures you can follow to try to solve the problem yourself.
Problem
Possible Cause
Do This
If...
Then...
Make sure the
controller’s power
cord is plugged
securely into the wall
outlet. Also make sure
all circuit breakers
(plastic pop-up tabs
shown in Figure 1-3 on
page 1-7) are in the
“ON” position (pushed
down). To see circuit
breakers, remove the
controller’s cover.
Test the outlet by
plugging in an ap-
pliance, like a lamp or
radio.
LEDs light, and the
trouble is gone,
The problem is
corrected.
1. All Phones
Dead: No
Dial Tone or
Lights
1. Equipment
controller not
receiving power.
Call the AT&T Helpline*.
LEDs light, but the
trouble remains,
LEDs do not light,
Go to Possible Cause 2.
Call the AT&T Helpline*.
LEDs are flashing,
The appliance does
not work,
The outlet is faulty.
Plug the controller into
a different outlet, check
fuse box, or call an
electrician.
2. The power outlet
may be faulty.
Call the AT&T Helpline*.
The appliance
works,
Problem is solved.
Go to Possible Cause 2.
2. Multiple
Phones Dead:
No Dial Tone
or Lights
1. Equipment
modules not
installed in correct
Make sure that the
modules are paired so
that a 206 module is
installed before each
400 module. If the
modules are not in the
right order, reinstall
them (see page 2-9.)
LEDs light,
The problem
remains,
order—LEDs on
several modules
are out.
If several LEDs are
out, try reseating the
leftmost module of the
ones with the lights
out (see page 2-9).
LEDs light,
Problem is solved.
Go to Possible Cause 4.
2. Several modules
are out.
The problem
remains,
3. One module is out.
Check the LEDs on
the front of the
modules. If a single
green LED is out, try
reseating the module
in the carrier (see
page 2-9).
LEDs light.
Problem is solved.
Call the AT&T Helpline*.
The problem
remains,
Problem is solved.
Go to Possible Cause 5.
Problem is solved.
Call the AT&T Helpline*.
4. Expansion cable
not properly
connected.
Check the connection.
Make sure the cable is
secure at both ends.
The LEDs light,
The problem
remains,
5. Expansion carrier
not receiving
power.
Make sure the power
cord is plugged into
the wall outlet and all
circuit breakers are in
the “ON” position.
Power up the expan-
sion carrier first, then
the primary carrier.
The LEDs light,
The problem
remains,
*
In the U.S., help is available 24 hours a day at 1 800 628-2888. In Canada, call your local AT&T authorized dealer.
Maintenance and Customer Support
C-3