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55
Diagnostic Codes Table
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.
LiftMaster System Installed System Informational
External Entrapment
Protection
Inherent Entrapment
Protection
Code Meaning Solution Saved
31
Control board has experienced an internal failure. Disconnect all power, wait 15 seconds, then reconnect power (reboot). If
issue continues, replace control board.
NO
34
Absolute Position Encoder error, not getting
position information from encoder
Check APE assembly and wiring connections. Replace the APE assembly
if necessary.
YES
35
Max-run-time exceeded error Check for an obstruction, then reprogram the limits. YES
36
Product ID error Was the control board just replaced? If so, erase limits, enter limit setup
mode and set limits. If not, disconnect all power, wait 15 seconds, then
reconnect power before changing product ID harness.
YES
37
Product ID failure Unplug product ID harness then plug back in. Disconnect all power, wait
15 seconds, then reconnect power before replacing product ID harness.
YES
38
Hard stop limit (Arm 1) Limit may be set too tightly against a non-resilient hard stop (re-adjust
limit). Operator may be at end of travel (re-adjust mounting).
NO
40
Battery overvoltage Too much voltage on the battery. Check harness. YES
41
Battery overcurrent Possible short of the battery charge harness. Check harness. Make sure
you do NOT have a 12V battery on a 24V system.
YES
42
No battery at boot up Check battery connections and installation. Replace batteries if depleted
to less than 20V on a 24V system. Make sure there is NOT a single 12V
battery on a 24V system.
YES
43
Exit loop error Failure or missing loop (SHORT or OPEN - LiftMaster Plug-in Loop
Detector only). Check loop wiring throughout connection. May be a short
in the loop, or an open connection in the loop.
YES
44
Shadow loop error
45
Interrupt loop error
46
Wireless edge battery low Replace batteries in wireless edge. YES
47
Motor Drive Fault Check motor drive connections. Disconnect all power, wait 15 seconds,
then reconnect power (reboot). If issue persists, replace motor drive
board.
YES
48
Hall Sensor Fault Check motor and motor drive connections. Disconnect all power, wait 15
seconds, then reconnect power (reboot). If issue persists, replace motor.
YES
49
Motor Drive Communications Fault Verify drive board power and connection to control board. Disconnect all
power, wait 15 seconds, then reconnect power (reboot). If issue
continues, replace motor drive
YES
50
Gate overspeed detected Make sure the gate is installed on a level surface and not on an excessive
grade.
YES
53
Brownout occurred
AC/DC board supply dipped below allowable level. Review power supply
and wiring. If rebooting, ensure enough time for discharge of power to
force a fresh boot.
YES
54
Wireless second operator communication error
Check the second operator for power. If OFF, restore power and try to run
the system. If powered, deactivate the wireless feature and then re-learn
the second operator.
YES
59
Configuration error with Motor, Drive Board, or ID
Resistor
Check connections between motor, motor drive, and control board.
Confirm correct part has been replaced, disconnect all power, wait 15
seconds, then reconnect power (reboot). If issue persists, remove and
replace latest part that was changed.
YES
60
Minimum number of monitored entrapment
protection devices not installed.
Review monitored entrapment protection device connections. See page
12 for minimum requirements.
NO
APPENDIX
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