Manual Chamberlain ML750 (page 20 of 22) (English)

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TROUBLE SHOOTING

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

• 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 1.

• 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.

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 page 4.

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 steps 22 and 23.

• 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?

• 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 25 and 26.

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. Optional vibration isolator:

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 25.

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 25 and 26.

Repeat the safety reverse test after the adjustment is complete.

11. Opener light does not turn on:

Replace light bulb (24V/21W maximum). Replace burned out bulbs with

rough 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 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 (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. Push and hold the black button until the door reaches the desired UP

(open) position. 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 (closed) limit by using the orange (DOWN)

and black (UP) buttons. Check to be sure the door is fully closed

without applying excessive pressure on the rail (rail should not bow

upwards and the 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 before the

door reaches the floor, the operator will attempt an Automated Limit

Setting, reversing the door off the floor and stopping at the set Up limit.

If the yellow indicator light does not blink 10 times, limits setting has

been successful and doesn't need to be manually done; the DOWN limit

will be set to the floor. Regardless of setting the limits automatically

or manually, the force MUST be learned in order to properly

complete the setting of limits. Refer to section 26, Setting the

Force.

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 manually

one more time.

• If the door stops in both the desired UP (open) and DOWN (close)

positions, proceed to

Test the Safety Reversal System.

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Chamberlain ML750 Manual

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