Chamberlain LA500U Troubleshooting Manual page 16

Some codes are saved in the code history and some are not. If a code is not saved it will briefly appear on the display as it occurs, then disappear.
When servicing of the operator is complete, erase the code history by pressing the STOP button until the display flashes "Er" then "CL" (about 6
seconds). When the codes have been erased the display will show "_ _".
Code Meaning
Force Reversal (Operator 1),
the primary operator has
91
detected an obstruction.
Force Reversal (Operator 2),
the secondary operator has
detected an obstruction.
92
RPM/STALL Reversal
(Operator 1), the primary
operator has detected an
obstruction.
93
RPM/STALL Reversal
(Operator 2), the secondary
operator has detected an
obstruction.
94
AC motor no start condition
95
Missing or damaged current
96 sensor
99 Normal Operation
DIAGNOSTIC CODES
Symptom
When attempting to open or close the
gate, the gate stops and reverses about
1 foot and then stops. The diagnostic
display shows 91.
When attempting to open or close the
gate, the gate stops and reverses about
1 foot and then stops. The diagnostic
display shows 92.
When attempting to open or close the
gate, the gate stops and reverses about
1 foot and then stops. The diagnostic
display shows 93.
If you attempt to run the operator again
after code 93, the gate will move then
stop and reverse about 1 foot, then
stop. The alarm will sound for 5
minutes. This means that the operator
has detected an obstruction twice in a
row (double entrapment).
When attempting to open or close the
gate, the gate stops and reverses about
1 foot and then stops. The diagnostic
display shows 94.
If you attempt to run the operator again
after code 94, the gate will move then
stop and reverse about 1 foot, then
stop. The alarm will sound for 5
minutes. This means that the operator
has detected an obstruction twice in a
row (double entrapment).
a) The gate and motor are not moving
or moving too slow.
b) The motor is moving, but not the
gate
c) Gate moves then stops.
d) The motor doesn't run
The gate will move briefly when
commanded then stop. No further
operation will be allowed.
n/a
15
Solution
• Press the reset button to shut the alarm off.
• Check for obstructions and debris in the
gate's path. Remove any obstructions or
debris.
• Adjust the limits and force
• Disconnect the gate and make sure the gate is
able to move freely and all hardware is
working correctly (i.e. gate hinges or wheels).
• Make sure the gate and gate operator were
installed correctly and the gate meets the
specification requirements for the operator.
• If all other solutions fail, there may be a
damaged operator component (i.e. chain,
sprockets, gear reducer, motor). Replace gate
component if necessary.
TEST: Attempt to run the operator.
• Press the reset button to shut the alarm off.
• Check the disconnect.
• Check for obstructions and debris in the
gate's path. Remove any obstructions or
debris.
• Adjust the limits and force
• Disconnect the gate and make sure the gate is
able to move freely and all hardware is
working correctly (i.e. gate hinges or wheels).
• Make sure the gate and gate operator were
installed correctly and the gate meets the
specification requirements for the operator.
• If all other solutions fail, check the code
history for code 34, which indicates the
operator is not receiving information from the
APE sensor. Check the APE assembly and
connections. Replace APE assembly if
necessary.
TEST: Attempt to run the operator.
a) Check for an obstructed gate, binding in the
mechanism, and relay board and start
capacitor connections.
b) Check the encoder cup and sensor on the limit
shaft, and wiring. Check the disconnect lever
for SL595U operators.
c) Check the encoder cup and sensor wiring.
d) Make sure that the motor harness is plugged
into the connector in the power board that
matches the correct input power.
Check and correct connections then power cycle
operator.
No action required
Saved
YES
YES
YES
YES
YES