LiftMaster CB11 Instructions page 39

Frequently asked questions
How long is the probable service life of a gate opener?
How long does it take to install a gate opener?
What happens in case of power failure?
Is it possible to open just one wing of the gate (pedestrian mode)?
Gate opener does not function / does not respond
when button is pressed.
Immediately after the gate has started moving, it
stops and reverses.
The gate opener does not open the gate fully.
The gate opener hums slightly but has no force
The controller doesn't respond when I alter the
Dip-switches.
The gate opener only works when I press and
hold the button on the remote control.
"Timer to close" doesn't work.
The gate opener doesn't respond at all, although
the controller has been connected (LEDs are on).
The gate opener doesn't respond at all; no LED is
on.
The gate opener stops suddenly and then restarts
only after a lengthy pause.
When used for private purposes, a correctly installed gate opener can
operate perfectly for in excess of 10 years. Both the gate and the gate
opener must be checked regularly and serviced in accordance with
their respective instructions.
Depending on your specific technical skills, the installation of the
mechanical components can take approx. 3 to 8 hours. Firstly, the gate
needs to be properly prepared such that installation work can
commence. The electrical connection work takes approx. 1 to 2 hours.
Each user should be instructed for at least 30 minutes with regard to
the operation of the gate opener, whereby its functionality should be
demonstrated and safety aspects, protective facilities and procedure in
case of power failure should all be explained.
All Chamberlain gate openers are equipped with a release system by
means of which the gate can be operated manually in case of power
failure.
Yes, it is possible. This process can be operated via remote control (a
2-channel remote control is the minimum requirement here) or via
switch operation (see "Standard" operation mode setting).
1. Connection to button is loose.
2. STOP switch connection is loose; STOP
LED is off.
3. Obstacle is blocking photocell in direction
of movement.
4. Safety edge is damaged or has
encountered an obstacle.
5. Gate opener is still released.
Obstacle in area of gate.
1. Are the post dimensions A+B correct?
2. Has the running time of the controller been
set correctly?
3. Has the force been set correctly?
1. Capacitor is not correctly connected to the
brown and black cable.
2. Force has not been set.
3. The gate opener has been released.
1. Controller in 'hold to run' operating mode.
2. A safety facility is not working correctly
(photocell, safety edge).
1. Remote control has not been programmed.
2. LEDs indicate a fault.
3. Photocell connected incorrectly.
4. Jumper between STOP and COM missing.
5. Motor terminal possibly not connected
properly.
Possibly power failure.
If the gate is operated constantly, the motor
will reach its cut-off temperature - protective
facility - as the gate opener is not designed
for permanent operation.
1. Check button and COM connections.
2. Check STOP switch connections
(STOP and COM).
3. Remove obstacle.
4. Remove obstacle and check
connections and wiring.
5. Lock gate opener.
Check area of gate for objects
1. Check A+B dimensions.
2. Reprogram as required – plus
approx. 3 seconds.
3. Correct force setting (gate opener
runs somewhat slower in windy
conditions).
1. Check wiring of capacitor.
2. Turn force potentiometer in a clockwise
direction.
3. Lock gate opener.
Disconnect controller from power
supply, then alter Dip-switches.
1. Disconnect controller from power supply,
then alter Dip-switches.
2. Observe LEDs; find and rectify fault.
1. Only works if the 2-cable photocell
770E(ML) or 771E(ML) has been
installed.
2. Then turn "timer to close"
potentiometer in a clockwise direction.
1. Programming remote control.
2. Find and rectify fault(s) (see description
of LEDs).
3. Check photocell connection /
programming.
4. Connect simple jumper.
5. Check terminals and connections.
1. Check conductor and zero conductor.
2. Check house fusing.
Allow motor sufficient time to cool (min. 15
minutes).