Chamberlain 4142DC Owner's Manual page 30

ADJUSTMENT STEP 2
Setting the Force
The force setting button is located on the back panel of the
motor unit. The force setting measures the amount of force
required to open and close the door.
1. Locate the orange button on the back panel of unit (Figure 1).
2. Push the orange button twice to enter unit into Force
Adjustment Mode (Figure 2). The LED (Indicator Light) will
flash quickly.
3. Push the remote control or door control (Figure 3). The door
will travel to the DOWN (close) position. Push the remote
control or door control again, the door will travel to the UP
(open) position. Push the remote control or door control a
third time to send the door to the DOWN (close) position.
The LED (Indicator Light) will stop flashing when the force has
been learned.
The unit has learned the forces required to open and close your
door.
The door must travel through a complete cycle, UP and DOWN,
in order for the force to be set properly. If the unit cannot open
and close your door fully, inspect your door to insure that it is
balanced properly and is not sticking or binding. See page 3,
"Preparing your garage door."
Without a properly installed safety reversal system, persons
(particularly small children) could be SERIOUSLY INJURED
OR KILLED by a closing door or gate.
• Too much force on garage door will interfere with proper
operation of safety reversal system.
• NEVER increase force beyond minimum amount required to
close garage door.
• NEVER use force adjustments to compensate for a binding or
sticking garage door.
• If one control (force or travel limits) is adjusted, the other
control may also need adjustment.
• After ANY adjustments are made, the safety reversal system
MUST be tested. Door MUST reverse on contact with
38 mm obstacle on the floor. Gate MUST reverse on contact
with 38 mm obstacle at the closing edge.
Figure 1
Black
Button
Antenna
Figure 2
Push Purple button
twice to enter
unit into Force
Adjustment Mode
Figure 3
30
Indicator
Light
Orange
Button
ORANGE
BLACK
or