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BATTERY BACKUP SYSTEM (BBU) DIAGNOSTICS
GREEN LED:
All systems are normal.
• A solid LED light indicates the batteries are fully charged.
• A flashing LED indicates the batteries are being charged.
NOTE: Batteries do not have to be fully charged to operate the motor
unit.
YELLOW LED:
The motor unit has lost power and is operating off of the BBU.
• A solid LED with beep, sounding approximately every 2 seconds,
indicates the motor unit is activating the door and is operating off of the
BBU.
• A flashing LED with beep, sounding every 30 seconds, indicates
batteries are low.
• Once the power is restored, the BBU will recharge. This is indicated by
a flashing green LED.
RED LED:
An error has been detected and the BBU will automatically shut off. The
BBU will attempt to restart by reconnecting to the batteries. If the error is
still present it will shut itself off again. This process will repeat every 5
minutes or until the error has been resolved. This is used to prevent
further draining of the batteries.
• If a red LED remains on when the power is restored, and is
accompanied by a beep sounding every 30 seconds, please call for
service.
OPERATION
1. Test the installed BBU with the motor unit.
To test the BBU, disconnect the motor unit power cord from the electrical
outlet.
• A solid yellow LED indicates the BBU is operating on battery power.
• A flashing yellow LED with beep indicates the BBU is operating on
battery power and that the battery charge is low.
• To test whether the BBU is functioning properly, open and close the
garage door.
• Re-connect the motor unit power cord back into the electrical outlet.
• Verify that the green LED is flashing on the BBU (indicates that the BBU
is now charging).
• Test completed.
2. Charge the battery.
• Allow the batteries 24 to 48 hours to fully charge before using the BBU
system.
A fully charged BBU supplies 24 Vdc to the motor unit for one to two
days of normal operation during an electrical power outage. If the battery
voltage drops too low, the batteries will disconnect and the motor unit
will no longer operate under battery power.
After the electrical power has been restored, the batteries will recharge
within 48 hours. Under normal usage batteries will last 3 to 5 years.
To obtain maximum battery life and prevent damage, also disconnect the
standby power if you unplug the motor unit while on vacation or any
other extended period of time.
NOTE: Door operation may be limited until batteries are fully charged.
The motor unit’s lights will not turn on during BBU mode.
To reduce the risk of FIRE or INJURY to persons use only LiftMaster
part 41B591 for replacement batteries.
Replacement Parts
12V Rechargeable Batteries (2) . . . . . . . . . . . . . . . . . . . . . . . . . . .41B591
Power Supply Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41A5726
Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72A35
FOR SERVICE, DIAL OUR TOLL-FREE NUMBER:
1-800-528-9131
LiftMaster.com
(Green LED)
(Yellow LED)
(Red LED)
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