LiftMaster Garage Door Problem Diagnosis

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1. Opener doesn't operate from either door control or remote:

• Does the opener have electric power? If it doesn't light, check the plug, fuse box or the circuit breaker. (Some outlets are controlled by a wall switch.)
• Have you disengaged all door locks?
• Is there a build-up of ice or snow under door? The door may be frozento ground. Remove any obstruction.
• The garage door spring may be broken. Have it replaced.

2. Opener operates from remote 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 Manual

3. Door operates from door control but not from remote:

• Replace battery if necessary.
• If you have two or more remotes and only one operates, review Program Your Opener, Remote and Keyless Entry see Manual.
• Is the door control button flashing? The opener is in lock mode. If you have a Multi-Function Door Control, push and hold the Lock button for 2 seconds. The door control button will stop flashing.

4. Remote has short range:

• Is battery installed or need replacing?
• Change the location of the remote control on the car.
• A metal garage door, foil-backed insulation or metal siding will reduce the transmission range.

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 floor area where garage door closes.
• Repeat Setting Limits and Force, see adjustment steps in manual. Repeat safety reverse test after adjustment is complete.

6. Door reverses for no apparent reason and opener light blinks for 5 seconds after reversing:

Check The Protector System™ (if you have installed this accessory).
If the light is blinking, correct alignment.

7. Opener noise is disturbing in living quarters of home:

If operational noise is a problem because of proximity of the opener to the living quarters, Vibration Isolator Kit 41A3263 can be installed. This kit was designed to reduce the "sounding board effect" and is easy to install.

8. The garage door opens and closes by itself:

Make sure remote push button is not stuck "on".

9. Door stops but doesn't close completely:

Repeat Setting the Limits, see adjustment step 26 in manual.
Repeat safety reverse test after any adjustment of door arm length, close force or down limit.

10. Door opens but won't close:

• Check The Protector System™ (if you have installed this accessory). If the light is blinking, correct alignment.
• If opener light does not blink and it is a new installation, repeat Setting the Limit and Force steps 26 and 27 see manual. Repeat the safety reverse test after the adjustment is complete.

11. Opener light does not turn on:

Replace light bulb (230V/40W maximum). Replace burned out bulbs with trough service light bulbs.

12. Opener strains:

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.

13. Opener motor hums briefly, then won't work:
• Garage door springs are broken. SEE ABOVE.
• If problem occurs on first operation of opener, door is locked. Disable door lock. Repeat safety reverse test after adjustment is complete.

14. Opener won't activate due to power failure:

• Pull manual release rope and handle down to disconnect trolley. Door can be opened and closed manually. When the power is restored, pull the manual release handle down and toward opener. The next time the
opener is activated, the trolley will reconnect.
• The Outside Quick Release accessory (if fitted) disconnects the trolley from outside the garage in case of power failure.

15. Setting the limits manually:
1. Press and hold the black button until the yellow indicator light starts flashing slowly then release.

2. Adjust the position of the door by using the black and orange buttons. Black moves the door UP (open) and orange moves the door DOWN (close).
Check to be sure the door opens high enough for your vehicle.

3. Push the remote control or door control. This sets the UP (open) limit and begins closing the door. Immediately press either the orange or the black button. The door will stop.
Adjust the desired DOWN (close) limit position using the black and orange buttons. Check to be sure the door is fully closed without applying excessive pressure on the rail (rail should not bow upwards and the chain/belt should not sag or droop below the rail). Push the remote control or door control. This sets the DOWN (close) limit and begins opening the door.

NOTE: If neither the black or the orange button is pressed, the door will reverse off the floor and the DOWN travel limit will be set automatically.

4. Open and close the door with the remote control or door control 2 or 3 times.

• If the door does not stop in the desired UP (open) position or reverses before the door stops at the DOWN (close) position,
repeat Setting the Limits and Force, see adjustment steps 26 and 27 see manual.
• If the door stops in both the desired UP (open) and DOWN (close) positions, proceed to Test the Safety Reversal System.