35
Troubleshooting
1. Opener doesn’t operate from either door control or remote
control:
• Does the opener have electric power? Plug lamp into outlet.
If it doesn’t light, check the fuse box or the circuit breaker.
(Some outlets are controlled by a wall switch.)
• Have you disengaged all door locks? Review installation
instruction warnings on page 14.
• Is there a build-up of ice or snow under door? The door may
be frozen to ground. Remove any obstruction.
• The garage door spring may be broken. Have it replaced.
• Repeated operation may have tripped the overload protector
in the motor. Wait 15 minutes and try again.
2. Opener operates from remote control but not from door
control:
• Is door control button lit? If not, remove the bell wire from
the opener terminals. Short the red and white terminals by
touching both terminals at the same time with a piece of wire.
If the opener runs, check for a faulty wire connection at the
door control, a short under the staples, or a broken wire.
• Are wiring connections correct? Review page 21.
3. Door operates from door control but not from remote control:
• Check battery. Replace battery if necessary.
• Is the light at the wall control fl ashing? Press button with key
symbol to unlock the opener against remote controls.
• Is the receiver LED fl ashing at the back of the opener when
the remote control is pressed? The opener receiver must
re-learn the remote control code. Follow the instructions on
page 32.
• If you purchased a new remote control then check the
carton of remote control for compatibility or call a LiftMaster
professional dealer.
4. Remote control has a short range:
• Is battery installed? If needed, change the battery.
• Change the location of the remote control on the car.
• A metal garage door, foil-backed insulation or metal siding
will reduce the remote control range.
• Use outside coaxial antenna adaptor to move antenna.
5. Door reverses for no apparent reason and opener light
doesn’t blink:
• Is something obstructing the door? Pull manual release
handle. Operate door manually. If it is unbalanced or binding,
call for professional garage door service.
• Clear any ice or snow from garage fl oor area where garage
door closes.
• Review force settings. Open and close the door in learn mode
for 3-5 consecutive cycles to allow the operator to adjust to
inconsistent doors.
• If door reverses in FULLY CLOSED position, relearn travel
limits.
• Repeat safety reverse test after adjustment is complete.
The need for occasional adjustment of the force and limit
settings is normal. Weather conditions in particular can affect
door travel.
6. Door reverses for no apparent reason and opener light blinks
for 5 seconds after reversing:
• Check The Protector System
®
. If the light is blinking, correct
alignment.
NOTE:
Continuously holding down the door control button will
allow the door to close if the Protector System
®
is not properly
aligned. The remote control will not close the door. The opener
lights will blink.
7. The garage door opens and closes by itself:
• Delete all remote controls and reprogram.
• Make sure remote control push button is not stuck “on”.
• Disconnect all push buttons or key switches attached and wait
one day.
8. Door stops but doesn’t close completely:
• Review limit adjustment section.
Repeat safety reverse test after any adjustment of door arm
length, close force or down limit.
9. Door opens but won’t close:
• Check the Protector System
®
. If the light is blinking, correct
alignment.
• If opener light does not blink and it is a new installation, check
the down force.
Repeat the safety reverse test after the adjustment is complete.
10. Opener light does not turn on:
• Replace light bulb (40 watts maximum).
11. Opener light does not turn off:
• There may be a defective earth at the ceiling or wall receptacle.
The opener must be grounded.
12. Opener strains or reversed during opening:
• Door may be unbalanced or springs are broken. Close door
and use manual release rope and handle to disconnect trolley.
Open and close door manually. A properly balanced door will
stay in any point of travel while being supported entirely by its
springs.
• If it does not, call for professional garage door service to
correct the problem. Do not change force settings.
13. Opener motor hums briefl y, then won’t work:
• Garage door springs are broken. SEE ABOVE.
• If problem occurs on fi rst operation of opener, the door is
locked. Disable the door lock. If chain was removed and
reinstalled, the opener may be out of phase. Remove chain;
cycle opener to down position. Observe drive sprocket. When
it turns in clockwise direction and stops in down position,
reinstall the chain.
Repeat safety reverse test after adjustment is complete.
14. Opener won’t activate due to power failure:
• Pull manual release rope and handle down and back to
disconnect trolley. Door can be opened and closed manually.
When the power is restored, pull the manual release handle
straight down. The next time the opener is activated, the trolley
will reconnect.
• The Outside Quick Release accessory disconnects the trolley
from outside the garage in case of power failure.
