Troubleshooting - LiftMaster 8500W Guide De L'utilisateur

Troubleshooting

The garage door opener doesn't operate from either the
door control or the remote control:
• Does the garage door opener have electric power? Plug
a lamp into the outlet. If it doesn't light, check the fuse
box or the circuit breaker. (Some outlets are controlled
by a wall switch.)
• Have you disabled all door locks? Review installation
instruction warnings on page 3.
• Is there a build-up of ice or snow under the door?
The door may be frozen to the ground. Remove any
restriction.
• The garage door spring may be broken. Have it
replaced.
My remote control will not activate the garage door:
• Verify the lock feature is not activated on the door
control.
• Reprogram the remote control.
• If the remote control will still not activate the door check
the diagnostic codes to ensure the garage door opener
is working properly.
The remote control has short range:
• Change the location of the remote control in your car.
• Some installations may have shorter range due to a
metal door, foil backed insulation, or metal garage
siding.
The door doesn't open completely:
• Check power door lock.
• Is something obstructing the door? Is it out of balance,
or are the springs broken? Remove the obstruction or
repair the door.
The door opens but won't close:
• Check cable tension monitor. If a 2nd cable tension
monitor has been removed, unplug and plug in the
garage door opener twice to reset it.
• If the garage door opener lights blink, check the safety
reversing sensors (see page 12).
• If the garage door opener lights don't blink and it is a
new installation see Adjustment Step 1. For an existing
installation, see below.
Repeat the safety reverse test after the adjustment
is complete.
The door reverses for no apparent reason and garage
door opener lights don't blink:
• Check cable tension monitor (see Installation Step 4). If
a 2nd cable tension monitor has been removed, unplug
and plug in the garage door opener twice to reset it.
• Is something obstructing the door? Pull the emergency
release handle. Operate the door manually. If it is
unbalanced or binding, call a trained door systems
technician.
• Clear any ice or snow from the garage floor area where
the door closes.
• Review Adjustment Step 1.
Repeat safety reverse test after adjustments.
My door will not close:
The safety reversing sensor must be connected and aligned
correctly before the garage door opener will move in the
down direction.
• Verify the safety sensors are properly installed, aligned
and free of any obstructions.
The garage door opener strains to operate door:
• The door may be out of balance or the springs may be
broken. Close the door and use the emergency release
handle to disconnect the door. Open and close the
door manually. A properly balanced door will stay in
any point of travel while being supported entirely by
its springs. If it does not, disconnect the garage door
opener and call a trained door systems technician.
The garage door opener motor hums briefly, then won't
work:
• The garage door springs may be broken. See above.
• If the problem occurs on the first operation of the
garage door opener, door may be locked. Disable the
power door lock.
The garage door opener won't operate due to power
failure:
• Manually open the power door lock.
• Use the emergency release handle to disconnect the
door. The door can be opened and closed manually.
When power is restored, pull manual release a second
time.
• When in Battery Backup mode, the opener should be
able to operate up to 20 times.
Door loses limits:
• Collar not tightened securely. Tighten collar and
reprogram limits (see Adjustment Step 1).
The garage door opener moves when the door is in
operation:
• Some minor movement is normal for this product. If it
is excessive the collar will wear prematurely.
• Check to make sure the torsion bar is not moving left/
right excessively.
• Check to make sure the torsion bar is not visibly moving
up and down as it rotates.
• Check that the opener is mounted at a right angle to
the jackshaft. If not, move the position of the mounting
bracket.
The garage door is beeping and the red LED is flashing:
The battery charge is low or the battery is dead.
• Replace the battery.
myQ Smartphone Control, wireless myQ devices, and
Timer-To-Close will not work:
• When in Battery Backup mode, myQ Smartphone
Control, wireless myQ devices and Timer-To-Close will be
disabled.
• myQ Remote LED Light must be installed to enable use
of Timer-to-Close or myQ Smartphone Control of the
door. Plug in the myQ Remote LED Light and make sure
it is programmed to the garage door opener. It may
take up to 5 minutes to enable Timer-to-Close and myQ
Smartphone Control.
Automatic door lock connector will not fit the door opener
plug:
Older model 24V door locks are incompatible. Use
automatic door lock model 841LM.
Automatic garage door lock does not activate when
garage door opens or closes:
In battery backup mode, the automatic garage door lock
will unlock when the garage door is opened, and will
remain disabled until power is restored.
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