Troubleshooting Diagnostic Chart - LiftMaster LJ8900W Manuel D'instructions

Troubleshooting
Diagnostic Chart
Your door operator is programmed with
self-diagnostic capabilities. The UP and
DOWN arrows on the door operator flash
the diagnostic codes.
DIAGNOSTIC CODE
Up Arrow Down Arrow
Flash(es) Flash(es)
1 1
1 2
1 3
1 4
1 5
1 6
2 1-5
3 1
3 3
3 5
4 1-4
4 5
4 6
DIAGNOSTIC CODE
The door operator will
not close.
The door operator will
not close.
The door control will not
function.
The door operator will
not close.
Door moves 6-8"
(15-20 cm) stops or
reverses.
No movement, only a
single click.
Door operator hums
for 1-2 seconds no
movement.
Door coast after it has
come to a complete stop.
No movement or sound.
The door operator moves
slightly, then stops
The battery status LED is
constantly flashing green.
The door operator
will not close or door
reverses during travel.
Door is moving stops and
or reverses.
Door operator runs
approximately 6-8"
(15-20 cm), stops and
reverses.
The door operator will
not close.
SOLUTION
Safety reversing sensors are not installed, connected or wires may be cut.
Inspect sensor wires for a disconnected or cut wire.
There is a short or reversed wire for the safety reversing sensors. Inspect
sensor wire at all staple points and connection points and replace wire or
correct as needed.
The wires for the door control are shorted or the door control is faulty.
Inspect sensor wire at all staple points and connection points and replace
wire or correct as needed.
Safety reversing sensors are misaligned or were momentarily obstructed.
Realign both sensors to ensure both LEDs are steady and not flickering.
Make sure nothing is hanging or mounted on the door that would interrupt
the sensor's path while closing.
Manually open and close the door. Check for binding or obstructions, such
as a broken spring or door lock, correct as needed. Check wiring connections
at travel module and at the logic board. Replace travel module if necessary.
Manually open and close the door. Check for binding or obstructions, such
as a broken spring or door lock, correct as needed. Replace logic board if
necessary.
Manually open and close the door. Check for binding or obstructions,
such as a broken spring or door lock, correct as needed. Replace motor if
necessary.
Program travel to coasting position or have door balanced by a trained
technician.
Replace logic board.
Activate the door operator again. If problem persists, replace logic board.
Battery backup charging circuit error, replace logic board.
If two cable tension monitors were previously installed and one has been
removed, unplug and plug in the operator three times to relearn the monitor
to the operator.
Manually open and close the door. Check for binding or obstructions, such
as a broken spring or door lock, correct as needed. If the door is binding or
sticking contact a trained door systems technician. If door is not binding or
sticking attempt to reprogram travel (refer to page 19).
Communication error to travel module. Check travel module connections,
replace module if necessary.
Safety reversing sensors are misaligned or were momentarily obstructed.
Realign both sensors to ensure both LEDs are steady and not flickering.
Make sure nothing is hanging or mounted on the door that would interrupt
the sensor's path while closing.
26
UP Button
DOWN Button