Troubleshooting Error Codes - Liftmaster H Manuel D'installation

TROUBLESHOOTING ERROR CODES

Logic 5.0 operators incorporate a self diagnostic feature built into
the MAS LED. In addition to indicating when routine maintenance
is due, the MAS LED can be used to troubleshoot some problems
with the operator.
If the MAS LED is flashing on and off rapidly, the Maintenance
Alert System has been triggered and the schedule operator service
is due. If the MAS LED flashes 2 or more pulses in a row followed
ERROR CODE DISPLAY
E1 1 blink
E2 2 blinks
E3 3 blinks
E4 4 blinks
E5 5 blinks
E6 6 blinks
E7 7 blinks
E8 8 blinks
E9 Flash on start of
movement
E10 10 blinks
NOTE: Error codes take priority over normal MAS LED operation. Error codes will repeat on the MAS every 1.5 seconds until cleared.
There may be more than one error present, but only the highest priority will flash. If the highest error is cleared, the next highest will
flash. All errors self-correct when the corrective action is taken and a reset is not needed.
Troubleshooting
DESCRIPTION
MAS triggered (cycles or months)
No RPM input during opening
(MRT) Maximum Run Time timed
out
Obstruction sensed or lost RPM
sensor input on closing
Stuck button pressed for greater
than 2 minutes
Invalid option card plugged into
option card receptacles
LiftMaster Monitored Entrapment
Protection (LMEP) device faulted
or removed for greater than
2 minutes
Brownout Detected
Motor movement at invalid time
Motor Phase Jumper changed
while unit is not in programming
mode
38
by a pause, an operator error has occurred. To view how many
errors currently exist, turn the selector dial to DIAGNOSTIC and
press the OPEN button. To read out each individual error code
(if more than one exists) press CLOSE. It is possible to have more
than one error at a time.
The chart below can assist with identifying the flashes on the
MAS LED.
EFFECT
None normal operation
The door only responds to
constant pressure commands
The door stops before reaching
set open or close limit(s)
Operator will reverse to OPEN
position
Stuck button on 3-button station
will not respond
Option card will not function
properly
Normal operation (5 second
constant pressure override
required to close)
Operator will run as long as
enough power is present
Operator will continue to
function normally for 5
operations and then default to a
constant pressure mode
The phase will not change
CORRECTION
Reset MAS (page 31).
Clutch is slipping, adjust clutch, or
verify RPM sensor connection or
replace RPM sensor.
NOTE: To relearn the RPM sensor,
move the door with a constant
pressure command. The door will
stop once relearned and normal
operation will resume.
First check Operator for any faults
(i.e., Bad Limit switch), manually
learn Max Run Timer (page 34) OR
reset factory defaults (page 34).
Remove obstructions, check
sensing devices, possible clutch
slippage.
Stuck button must be unstuck
before it will be recognized as an
input.
Refer to accessories page for list
of supported option card(s).
Cleared when entrapment
protection device is cleared or
connected.
1. Check AC line for voltage.
2. Check transformer secondary
for low voltage. Too many
accessories may be connected
to the transformer.
Check relays and the drive circuitry
to ensure that they are turning off.
Operator must know that they are
turning off. Operator must run
correctly for two starts for the
error to be cleared.
Enter programming mode and
move phase jumper to change
phase.