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Battery Backup Unit (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.
OPERATING INSTRUCTIONS
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 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 24V DC 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 battery backup 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 Chamberlain part #41B591 for replacement
batteries.
WARNING
CAUTION
WARNING
WARNING
(Green LED)
(Yellow LED)
(Red LED)
