15
Gate opener does not function / does not respond
when button is pressed.
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.
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.
The controller doesnʼt respond when I alter the
Dip-switches.
Disconnect controller from power
supply, then alter Dip-switches.
“Timer to close” doesnʼt work.
1. Only works if the 2-cable photocell
770A(ML) or 771A(ML) has been
installed.
2. Then turn “timer to close”
potentiometer in a clockwise direction.
The gate opener doesnʼt respond at all; no LED is
on.
Possibly power failure.
1. Check conductor and zero conductor.
2. Check house fusing.
Immediately after the gate has started moving, it
stops and reverses.
Obstacle in area of gate.
Check area of gate for objects
The gate opener hums slightly but has no force
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. Check wiring of capacitor.
2. Turn force potentiometer in a clockwise
direction.
3. Lock gate opener.
The gate opener only works when I press and
hold the button on the remote control.
1. Controller in ʻhold to runʼ operating mode.
2. A safety facility is not working correctly
(photocell, safety edge).
1. Disconnect controller from power supply,
then alter Dip-switches.
2. Observe LEDs; find and rectify fault.
The gate opener doesnʼt respond at all, although
the controller has been connected (LEDs are on).
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.
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.
The gate opener stops suddenly and then restarts
only after a lengthy pause.
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.
Allow motor sufficient time to cool (min. 15
minutes).
What happens in case of power failure?
Your Merlin MGS gate opener is equipped with a release system by
means of which the gate can be operated manually in case of power
failure.
Is it possible to open gate for pedestrian mode?
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 & pedestrian mode”)
Troubleshooting and Frequently Asked Questions
The gate must follow a slope.
Not recommended! Change gate! The gate can move in an uncontrolled (dangerous) manner
if the gate opener has been released. A stronger force is needed in the upwards direction of
the slope and then, in the opposite direction, the gate openerʼs force is too strong.
The force setting has been altered, but no
difference is apparent.
Disconnect the controller from the power supply for a few seconds in order to activate the
control boardʼs self-diagnosis functionality.
The remote controlʼs range is too short.
The installation of an external aerial is recommended as the controller with the short cable
aerial is located either behind the post or near ground level in most cases. The optimum
location of the aerial is as high as possible in all cases. An appropriate aerial with installation
kit can be obtained from Chamberlain as an accessory with the product ref. no. ANT4X-
1EML.
The control board does not work any more using
the transmitter, only with the switch and even then
only as long as a button is pressed and kept
pressed.
Open with push-button (1) or CLOSE with push-
button (2)
1.Dip switch setting not as desired
2.A safety photocell, a contact strip or the
stop disables the control board
3.Only one photocell was connected for
OPEN
1.Correction of the dip switch,
elimination of fault required. If the fault
cannot be repaired, it will be necessary
to “reset” and re-program (see
photocell)
2.At least one photocell must be
connected and activated for CLOSED or
OPEN & CLOSED.
