LiftMaster LA400 Residential DC Linear Gate Operator - Manual (Page 44)

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TROUBLESHOOTING
» TROUBLESHOOTING CHART
OPERATOR IS DEAD
No LED lights are on.
OPERATOR DOES NOT RUN
Operator does not respond
to any commands.
MOTOR DOES NOT RUN
Relays “click” when radio
or SBC signal is given, but
the operator does not
move.
GATE STOPS AND
REVERSES
(Force Reversal)
RPM REVERSAL
GATE STOPS
Gate starts to run, then
stops and does not reverse.
GATE OPENS BUT DOES
NOT CLOSE
Audible beeps (3 times)
when command is given.
GATE’S DO NOT OPEN/
CLOSE IN SYNC
GATE DOES NOT
AUTOMATICALLY CLOSE
Auto Close Timer not closing
gate.
ACCESSORY DEVICE NOT
WORKING PROPERLY
1) No voltage to board. Battery must be >23 V, AC or needs to be connected.
2) Bad control board. Replace control board.
1) Low/disconnected battery. Voltage must be >23 V at battery connection.
2) Remote not programmed. See Programming Remote instructions.
3) STOP connection loose/disconnected. Check STOP connections.
4) Constant Open Command (Check LED’s). Clear all Open/Safety devices from obstruction.
5) Limits not programmed correctly. See Programming Limits instructions.
6) Bad control board. Replace control board.
1) Low Battery. Voltage must be >23 V at battery connection.
2) Cable wiring between control box and Check wiring on control board to arm, replace wire if needed.
operator arm disconnected or loose.
3) Batteries not connected. Connect batteries.
4) Bad motor. Replace motor.
5) Bad control board. Replace control board.
1) Low battery. Voltage must be >23 V at battery connection.
2) Gate met an obstruction. Clear gate from obstruction.
1) Constant Open Command (Check LED’s). Clear all Open/Safety devices from obstruction.
2) Timer-to-Close not set. See Timer-to-Close section for adjustment instructions.
3) Accessory device wired to Open Only Rewire desired accessory device to Single Button Input.
command.
FAULT POSSIBLE CAUSE FIX
1) Obstructed Arm (bottoms out). Check for obstruction on arm, verify arm is not bottomed out.
2) Bad RPM Sensor. Replace arm.
3) Too much mA pulled off board. Move accessories to separate power source. Use reference chart on next page to
determine max mA draw for circuit board.
1) Battery Low >23.5 V Operator will resume normal operation once battery voltage reaches 24 V.
1) Bipart Delay not set. See Bipart Delay section for adjustment instructions.
2) Limits not programmed correctly. See Programming Limits section for instructions.
3) Incorrect Arm Installation See Installation section for instructions.
1) Timer-to-Close not turned on. See Timer-to-Close section for instructions.
2) Gate has opened on Obstruction Reversal. Check DIAG code, clear obstruction.
3) Operator in “Party Mode”. Use remote control/SBC to resume normal operation.
4) Constant Open Command (Check LED’s). Clear all Open/Safety devices from obstruction.
1) Gate met an obstruction. Clear gate from obstruction.
2) Force set too low. See Force Adjustment section.
3) Bad gate hardware. Service/replace gate hardware.
4) Incorrect Arm installation. See Installation section of operator arm.
1) Not installed properly. Check for proper installation of accessory.
2) Enabling Switch not turned on. Turn applicable switches on.
3) Loose/disconnected wires. Check proper installation of wires.
4) Bad accessory device Replace accessory device.