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Troubleshooting
Additional Troubleshooting
The garage door opener doesn't operate from either the door control or the remote control:
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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.)
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Have you disabled all door locks? Review installation instruction warnings on page 8.
• Are the wiring connections correct? Review Installation Step 5.
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Is there a build-up of ice or snow under the door? The door may be frozen to the ground. Remove any restriction.
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The garage door spring may be broken. Have it replaced (see page 3 for reference).
The door opener operates from the single button control station, but not from a remote control:
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Reprogram the remote control and replace the battery if necessary. Repeat with all remote controls.
The door opens and closes by itself:
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Be sure that all remote control push buttons are off.
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Remove the bell wire from the single button control station terminals and operate from the remote only. If this solves the problem,
the single button control station is faulty, or there is an intermittent short in the wire. Replace the control station.
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Erase the memory and reprogram all remote controls (refer to the instructions provided with the remote control or visit
LiftMaster.com/Customer-Support).
My remote control will not activate the garage door:
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Verify the lock feature is not activated on the door control.
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Reprogram the remote control.
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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:
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Change the location of the remote control in your car.
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Some installations may have shorter range due to a metal door, foil backed insulation, or metal garage siding.
The door stops or reverses to open limit and the opener beeps and lights flash 5 times:
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Is something obstructing the door? Is it out of balance, or are the springs broken? Remove the obstruction or call a trained door
system technician to repair the door.
The door doesn't open completely:
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Check power door lock.
The door opens but won't close:
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The safety reversing sensor must be connected and aligned correctly before the door opener will move in the down direction. If you
are able to close the door using constant pressure, verify the safety reversing sensors are properly installed, aligned and free of any
obstructions (see page 13).
The door reverses for no apparent reason:
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Clear any ice or snow from the garage floor area where the door closes.
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Review Adjustment Step 3.
Repeat safety reverse test after adjustments.
My door will not close:
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The safety reversing sensor must be connected and aligned correctly before the garage door opener will move in the down
direction.
- Verify the safety reversing sensors are properly installed, aligned and free of any obstructions.
The garage door opener strains to operate door:
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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:
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The garage door springs may be broken. See above.
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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:
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Manually open the power door lock.
Cable unspooling upon obstruction near top limit:
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If cable unspools, please contact a Professional Door Dealer for service.
The door hits the floor and reverses for no reason:
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Verify collar screw install and tighten set screws.
The garage door opener motor hums briefly, then won't work:
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Verify collar screw install and tighten set screws.
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For the complete manual visit LiftMaster.com/Customer-Support
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