Chamberlain 7200 - Page 35

Situation
Having
a
Problem?
þontinued)
Probable
Cause
& Solution
The
door
opens
but
won't close:
1.
lf the
opener
lights blink,
check
the
safety
reversing
sensor.
see
page
23.
2.
lf the
opener
lights
do
not
blink
and
it is
a new
installation,
check
the down
force
See
Adjustmeñt
Step
2,
page
29. For
an existing
installation,
see
below.
Repeat
the
safety
reverse
test
after
the
adiustment
is complete.
The
door
reverses
for
no apparent
reason
and
opener
ligh(s)
don't
blink:
1. ls
something
obstructing
the
door?
Pull the
manual
release
handle.
Operate
the
door
manually.
lfjt
is unbalañced
or
binding,
call
for
professional
garage
door service.
2. Clear
any
ice
or snow
from
the
garage
floor
area
where
the door
closes.
3.
Review
the
force
adjustment
procedures
on
page
29.
Repeat
the
safety
reverse
test
after
the
adiustment
is complete.
4. lf
door
reverses
inlhe
futty
closed
position,
decrease
the travel
limits
(page 28)'
Repeat
safety
reverse
test
after
the
adiustment
is complete.
The need
for
occasionat
idjustment
of the
force and
limit settings
is normal.
Weather
condítions
in
particular can
affect
door
travel.
The door
reverses
for
no apparent
reason
and
opener
ligh(s)
blink
for 5 seconds
after
reversing:
Check
the
safety
reversing
sensor.
Remove
the
obstruction
or align
the
receiving
eye
See
page
23.
The
opener
lights . . .
don't
turn
on:
1. Replace
the light
bulb(s)
(75
watts
maximum).
Use
a standard
neck
garage
door
opener
bulb
if regular
bulb
burns
out.
. . , don't
turn
off:
ls the
Light
Feature
on?
Turn
if off.
The
opener
strains
or
maximum
force
is
needed
to operate
door:
The
door
may
be
out
of balance
or
the springs
are
broken'
Close
the
door and use
the
manual
releaie
handle
to disconnect
the
troliey.
Open
and
close
the
door
manually.
A
órópðrly
batanced
door
will stay
in
any
point
of
travel
while being
supported
entirely
by
its
¡p;i;ô"]
tt
it does
not,
disconnect
the ôpener
and
call
for
professional
garage
door
service.
Do
not
increase
the
force
to
operate
the
opener.
The opener
motor
hums
briefly,
then
won't
work:
1. The
garage
door
springs
are
broken.
See
above.
2.
lf the
problem
occurs
on the
flrst
operation
of
the opener,
door
may
be locked.
Disable
the dòor
tock.lf
the
chain
was removed
and
re-installed,
the
motor
may be
out
of
phase
Remove
the chain;
cycle
the
motor
to
the down
position.
Observ.e
the drive
sprocket'
Wfràn
it turns
in
a clo?kwise
direction
and
stops
in the
down
position,
reinstall
the
chain.
Repeat
the
safety
reverse
test
after
the adiustment
is complete.
The opener
won't
operate
due
to
power
failure:
1. Use
the
manual
release
rope
and
handle
to
disconnect
the
trolley.
The
door
can
be
ãpãnàO
and
closed
manuaily.
When
power
is restored,
press
the
Door Control
push
bär
or
button
and
trolley
will automatically
reconnect
(unless
trolley
is in
lockout
position.)
See
Page
32.
2.
The
Outside
Quick
Release
accessory
(for
use
on
garages
with
no service
door)
disconnects
the
trolley
from
outside
the
garage
in case
of
power
failure.
The chain
drooPs
or sags:
It is
normal
for the
chain
to
droop
slightly
in the
closed
door
position.
Use the
manual
relãase
rope
and
handle
to disconnelt
the trolley.
lf
the chain
returns
to the normal
f'ãigÀi
*h'en
the
trolley
is
disengaged
and the
door
reverses
on
a one-inch
board
lorâ
Zx+
laid
flat),
no adjustments
are
needed.
(See
page
11')
35
Nortek, Exhibit 1012