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TROUBLESHOOTING
TROUBLESHOOTING ERROR CODES
Logic 4.0 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
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.
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 error codes
ERROR CODE
DISPLAY
DESCRIPTION
EFFECT
CORRECTION
E1
1 blink
MAS triggered (cycles or months)
None normal operation
Reset MAS (page 32).
E2
2 blinks
No RPM input during opening
The door only responds to
constant pressure commands
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.
E3
3 blinks
(MRT) Maximum Run Time timed
out
The door stops before reaching
set open or close limit(s)
First check Operator for any faults
(i.e., Bad Limit switch), manually
learn Max Run Timer (page 35)
OR
reset factory defaults (page 35).
E4
4 blinks
Obstruction sensed on closing
Operator will reverse to OPEN
position
Cleared by removing obstruction or
realigning photoelectric sensors
and giving a close command.
E5
5 blinks
Stuck button pressed for greater
than 2 minutes
Stuck button on 3-button station
will not respond
Stuck button must be unstuck
before it will be recognized as an
input.
E6
6 blinks
Invalid option card plugged into
option card receptacles
Option card will not function
properly
Refer to accessories page for list
of supported option card(s).
E7
7 blinks
LiftMaster Monitored Entrapment
Protection (LMEP) device faulted
or removed for greater than
2 minutes
Normal operation (5 second
constant pressure override
required to close)
Cleared when safety device is
cleared or connected.
E8
8 blinks
Brownout Detected
Operator will run as long as
enough power is present
1. Check AC line for voltage.
2. Check transformer secondary
for low voltage. Too many
accessories may be connected
to the transformer.
E9
Flash on start of
movement
Motor movement at invalid time
Operator will continue to
function normally for 5
operations and then default to a
constant pressure mode
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.
E10
10 blinks
Motor Phase Jumper changed
while unit is not in programming
mode
The phase will not change
Enter programming mode and
move phase jumper to change
phase.
