LiftMaster HCTDCU HCTDCU Installation Manual - Page 35

DIAGNOSTIC CODES, Meaning, Solution, Saved

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TROUBLESHOOTING DIAGNOSTIC CODES 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 31 34 35 Meaning Main control board has experienced an internal failure. Absolute Position Encoder Error, not getting position information from encoder Max-Run-Time Exceeded Error 36 Product ID Error 37 Product ID Failure 38 Hard Stop Limit 40 Battery overvoltage 41 Battery overcurrent 42 No battery at boot up 43 Exit Loop Error 44 Shadow Loop Error 45 Interrupt Loop Error 46 Wireless edge battery low 50 Door out of balance detected 53 Brownout occurred Solution Disconnect all power, wait 15 seconds, then reconnect power (reboot). If issue continues, replace main control board. Check APE assembly and wiring connections. Replace the APE assembly if necessary. Check for an obstruction, then reprogram the limits. 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. Unplug product ID harness then plug back in. Disconnect all power, wait 15 seconds, then reconnect power before replacing product ID harness. 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). Too much voltage on the battery. Check harness. Make sure there is NOT a 24V battery on a 12V system. Possible short of the battery charge harness. Check harness. Make sure you do NOT have a 12V battery on a 24V system. Check battery connections and installation. Replace batteries if depleted to less than 20V on a 24V system or less than 10V on a 12V system. Make sure there is NOT a single 12V battery on a 24V system. 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. Replace batteries in wireless edge. Check counterbalance spring condition and setting. 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. Saved NO YES YES YES YES NO YES YES YES YES YES YES YES 35

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35
TROUBLESHOOTING
DIAGNOSTIC CODES
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.
Code
Meaning
Solution
Saved
31
Main control board has experienced an
internal failure.
Disconnect all power, wait 15 seconds, then reconnect power (reboot). If issue
continues, replace main 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
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. Make sure there is NOT a 24V
battery on a 12V system.
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 or less than 10V on a 12V 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
50
Door out of balance detected
Check counterbalance spring condition and setting.
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
LiftMaster System
Installed System
Informational
External Entrapment
Protection
Inherent Entrapment
Protection