LiftMaster GH GH LOGIC VERSION 2 Manual - Page 20

Trouble Shooting - parts

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TROUBLE SHOOTING Troubleshooting Guide SYMPTOM Each open command will open the door about a foot and a half then stop, after reaching the open limit each close command will close the door about a foot and a half then reverses back to full open. The door will open some but not completely. And the door will close some and not completely. Extra commands are able to get the door to move completely The door will open some but not completely. An extra open command is able to get the door to open completely The door will open but will only close after a 5 second delay with constant pressure on the close button. The operator will not respond to any commands PROBABLE CAUSE RPM sensor is not adjusted correctly. The Maximum run timer is not set correctly. There may be a Mid Stop set. a) The Photo Eyes, edge or other sensing device is obstructed or activated. b) The Logic board thinks that the direct connect photo eyes are attached and blocked a) Operator control station is wired wrong b) Motor is malfunctioning RESOLUTION Reset the RPM sensor. Also verify that the software is version 260 or better. Order replacement chips from Parts and Service. Reset the Maximum Run Timer Reset the mid-stop by programming it to be at the open limit. a) Remove the obstruction, check the safety device wires for continuity and shorts. b) Unlearn the photo eyes from the memory (see clear memory section). Also verify that the Logic Board Chip is Version 260 or better. Order replacement Chips from Parts and Service. a) Use the LEDs to help check correct wiring (see Diagnostic procedure) Verify that the board is accepting commands by using the onboard control station. b) Verify voltage getting to the motor. Clearing The Memory 3 - steps STEP 1: To reset most of the user installed settings back to factory defaults: 1. Turn all the dip switches ON. 2. Press and hold the Learn button about 5 seconds. 3. The Learn LED will turn off while you hold the button down and turn back on about 5 seconds later. 4. Return the dip switches to the desired wiring type. Note: A. The Max Run Timer is now set to 90 seconds B. The Timer to Close is now set to 0 seconds C. The Mid Stop is now deactivated D. The Maintenance Alert System is now deactivated Note: To clear the Mid Stop only Set/Program the Mid Stop at the open limit. The logic board understands this to mean that no mid stop is desired. 20

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20
TROUBLE SHOOTING
Clearing The Memory 3 - steps
STEP 1
: To reset most of the user installed settings back to factory defaults:
1. Turn all the dip switches
ON
.
2. Press and hold the Learn button about 5 seconds.
3. The Learn LED will turn off while you hold the button down and turn back on about 5 seconds later.
4. Return the dip switches to the desired wiring type.
Note:
A. The Max Run Timer is now set to 90 seconds
B. The Timer to Close is now set to 0 seconds
C. The Mid Stop is now deactivated
D. The Maintenance Alert System is now deactivated
Note:
To clear the Mid Stop only Set/Program the Mid Stop at the
open limit.
The logic board understands this to mean that no mid
stop is desired.
Each open command
w
ill open
the door a
b
o
u
t a foot and a half
then stop, after reaching the open
limit each close command
w
ill
close the door a
b
o
u
t a foot and a
half then re
v
erses
b
ack to f
u
ll
open.
RPM sensor is not adj
u
sted
correctly.
Reset the RPM sensor.
Also
v
erify that the soft
w
are is
v
ersion 260 or
b
etter.
Order replacement chips from
Parts and Ser
v
ice.
The door
w
ill open some
bu
t not
completely.
And the door
w
ill
close some and not completely.
Extra commands are a
b
le to get
the door to mo
v
e completely
The Maxim
u
m r
u
n timer is not
set correctly.
Reset the Maxim
u
m R
u
n Timer
The door
w
ill open some
bu
t not
completely. An extra open
command is a
b
le to get the door
to open completely
There may
b
e a Mid Stop set.
Reset the mid-stop
b
y
programming it to
b
e at the open
limit.
The door
w
ill open
bu
t
w
ill only
close after a 5 second delay
w
ith
constant press
u
re on the close
bu
tton.
a)
The Photo Eyes, edge or
other sensing de
v
ice is
o
b
str
u
cted or acti
v
ated.
b
) The Logic
b
oard thinks that
the direct connect photo eyes
are attached and
b
locked
a)
Remo
v
e the o
b
str
u
ction,
check the safety de
v
ice
w
ires
Use the LEDs to help check
correct
w
iring (see
Diagnostic proced
u
re)
V
erify
that the
b
oard is accepting
commands
b
y
u
sing the
on
b
oard control station.
for contin
u
ity and shorts.
b
)
Unlearn the photo eyes
from the memory (see clear
memory section).
Also
v
erify that the Logic Board
Chip is
V
ersion 260 or
b
etter.
Order replacement
Chips from Parts and Ser
v
ice.
The operator
w
ill not respond to
any commands
a)
Operator control station is
w
ired
w
rong
b
) Motor is malf
u
nctioning
a)
b
)
V
erify
v
oltage getting to the
motor.
SYMPTOM
PROBABLE CAUSE
RESOLUTIO
N
Troubleshooting Guide