LiftMaster Garage Door
Opener Troubleshooting FAQ
Please look through our garage door opener questions and answers that other customers have already asked (frequently asked questions). You may find your answer here. Otherwise,
contact us. We would be happy to answer your questions personally.
For Free Technical Advice and Help, contact one of our representatives today. To place your order by phone, please call us Mon-Fri 6:30am-4:30pm Pacific Time. For International calls, use (818) 725-7125.
My garage door opener is smoking and won't open. What's wrong with it?
You most likely have a burned drive belt, although there is the possibility of having a burned circuit board or capacitor. All are easily replaced.
I hear a hum coming from the garage door opener and it won't open. What is the problem?!?
A humming operator is usually the outcome of a burned out capacitor.
What's the average lifespan of a garage door opener?
Average lifespans of 8 - 10 years can be expected, although there are operators out there which last as little as 5 years yet as long as 25 years (or more!). If your operator is getting old, consider replacing it with an up-to-date machine with all the latest safety features.
I need certain parts for my garage/gate operator, can I purchase them from you?
Absolutely, and you will save a lot in the process! You will need to
contact us for that, for special ordering and prices.
Are batteries and clips included?
Yes, batteries and clips are included, in some cases, key chains and velcro attachments.
Can I pay by check or a postal order?
Certainly, simply download and complete our printable order form and send it to us.
Opener Does Not Work
A. Make sure power cord is plugged into a properly
grounded 3-prong 120 volt outlet. Plug in a drill or other electrical
tool to test for power.
B. If opener has been cycled several times, the motor
overload protector may be activated. Wait approximately 10 minutes for
the motor to cool and try again.
C. If a four-function Wall Console is being used, make
sure the Vacation Switch is in the "UNLOCKED" position. The
power unit can not be activated nor programmed with the
Vacation Switch in the "LOCKED" position.
D. If door is severely out of balance, the opener may not
be able to exert enough force to move it. Make sure all locks are
removed. Pull the Emergency Disconnect Cord to release the door from
the opener. Check to see if the open will operate if not connected to
the door. If opener now operates, review "Door Balance Test"
in you Owner's Manual.
Hand Held Transmitter Does Not Work or
Has Short Range
A. Review the "Radio Coding Instructions" in
the Owner's Manual.
B. The battery in your transmitter may be dead or weak.
Replace the battery with the same type.
C. Try moving or coiling the antenna wire on the opener.
D. CB radios, computer equipment, powerful communication
signals, and other door openers may cause undesirable interference and
shorten radio range.
Pushbutton Does Not Work
A. Make sure the pushbutton wires are not touching each
other at the rear of the opener or at the pushbutton.
B. If the wires are not touching each other and the
problem still exists, disconnect the wires from the back of the opener
and "short" across the two pushbutton screws using a key or
screwdriver. If opener now operates, the pushbutton wires are probably
shorted or broken.
Lights Flash on Opener
A. This may be caused by activating the obstruction
system that is controlled by the open or close force adjustment
on the rear of the opener. If it requires more force to move the door
than the opener can supply, the lights on the opener will blink. A
common cause is a poorly operating door or an obstruction. Review "Door
Balance Test" and "Open and Close Force Adjustments" in
B. If the beam sensor is not aligned or working
correctly, the door can only be closed by holding the wall-mounted
pushbutton. The transmitter cannot be used to close the door. The
light on the opener will flash and the door will reverse and open if
the pushbutton is not held until the door is fully closed.
C. If something obstructs the door while closing, it will
reverse and open - lights will flash. If something obstructs the door
while opening, it will stop - lights will flash.
Door Closes - Then Opens When Reaching
A. Is a rake handle, garden hose, snow, ice, etc.
obstructing the door? Remove the obstruction then try closing the door
B. Due to climatic conditions many concrete floors will
heave or sink. Turn the (small black) close travel adjustment 1/4
turn opposite the direction of the arrow on the cover, then review the
"Close Position" and "Entrapment Test"
instructions in the manual.
Excessive Tube Bow
A. Check to see that the powerhead is securely mounted
and the door operates freely. Review "Door Balance Tests: in the
manual. Is something obstruction the door?
B. Review the "Close Position" and "Entrapment
Test" instructions in the manual.
Opener Activates by Itself
A. Carefully check the wiring to the pushbutton and
electric key switch (if used). An intermittent "short"
caused by a staple or frayed wire may be the problem.
Light Stays On
A. The light time delay on the opener will keep the light
on for approximately 4-1/2 minutes after the system has be activated,
then will turn the light off automatically.
B. If the opener has a worklight switch (which is
supplied only with a four-function wall console), slide the switch to
C. If the opener has a pedestrian switch (which
is supplied only with a four-function wall console), the light will
stay on for 4-1/2 minutes after the pedestrian door has been opened.
Not Enough Open or Close Travel
A. If you operated the power unit before it was
completely installed or if you did not position the traveler the
correct distance from the tube support, the limits and traveler may be
out of synchronization.
B. Turn off power, remove and relocate traveler by
disconnecting chain from sprocket, re-assemble and try adjusting
Something Broke - Need Assistance?
Identify the part in the manual, then click here to contact us.