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Chamberlain LiftMaster LM70EVFF - Motor Hums, No Function; Opener Works One Direction Only; Belt Rattles on Rail; Opener No Start Due to Power Failure

Chamberlain LiftMaster LM70EVFF
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en 13
9. Motor hums and runs very briey, but does not function:
Garage door springs are defective� Close the door and disconnect
from the opener by pulling on the handle of the carriage (manual
release)� Open and close door manually� If the door is properly balan-
ced, it is held at each point of the doorway by the door springs alone�
If this is not the case, contact your service centre�
If this problem appears during the rst use, the door may be locked.
Deactivate door lock�
Release opener from the door and try without door. If the door is ne,
reprogramme operating force and stretch of way
10. Opener works only in one direction:
Door springs may be defective or the door is sti󰀨 in one direction.
If the door is ne, re-programme operating power and stretch of way
of the opener
11. The belt rattles on the rail:
Adjust the belt tension� The cause is usually a very tight chain/belt�
The spring on the clamping device of the rail must not be compres-
sed completely
The door runs unevenly and makes the drive vibrate� Improve door
run�
12. Opener will not start due to power failure:
Disconnect from the opener by pulling on the handle on the carriage
(manual release)� The door can now be manually opened and closed�
If the opener is re-activated, the carriage also gets re-connected�
If installed, the carriage is detached from the drive in case of power
failure by an external emergency release from outside the garage�
13. Door reverses after the force was programmed:
See if the rail bends� The opener requires a lot of power to move the
door� Repair or install door correctly
Door is very heavy or in poor condition� Call a specialist�
14. Rail bends on the opener:
Door is heavy, very heavy, sti󰀨 or in poor condition. Call a specialist.
A swing of the rail while moving is a sign of an unevenly functioning
door with constantly changing power requirements� Call specialist,
possibly lubricate doorAn additional suspension on the rail can be a
remedy
14. Rail bends on the opener:
Door is heavy, very heavy, sti󰀨 or in poor condition. Call a specialist.
A swing of the rail while moving is a sign of an unevenly functioning
door with constantly changing power requirements� Call specialist,
possibly lubricate doorAn additional suspension on the rail can be a
remedy
15. The opener „runs“ (audible turning of motor) but the carriage
does not move:
The carriage is released from the opener
In a new installation: During the assembly of motor and rail, the
pre-assembled adapter sleeve between the motor shaft and the rail
was not installed� This sleeve is pre-assembled at factory, but can be
removed� Standing behind the opener it can be observed whether the
gearwheel turns in the rail or just the motor
In a new installation: The belt has come o󰀨 from the gearwheel in the
rail� Standing behind the opener, you can see the gearwheel�
After years of use: Is the release defective or continuously disenga-
ged?
After years of use: The sleeve between rail and motor or the motor
control gear is defective�
16. The door releases by itself from the carriage and stops:
An external release that has been installed during a power failure
should be checked whether it stretches and releases during the ope-
ning of the door� Watch the mechanism and reset if necessary
The handle of the release mechanism should not get caught in other
items�
17. Setting the Force
The force setting button is located behind the cover at the operators
backside� The force setting regulates the amount of power required
to open and close the door
1� Open cover on the backside of the opener� Locate the yellow
round button (2)�
2� Push the yellow round button (2) twice to enter unit into Force
Adjustment Mode� The LED (3) (indicator light) and the UP button
will ash. Push UP button. The operator will travel to the UP position
learning the required amount of force� Once the UP limit is reached
the LED and the DOWN button a start to ash. Push DOWN button.
The operator will travel to the DOWN position learning the required
amount of force�

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