STANDBY POWER UNIT (SPU) 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 SPU.
• A solid LED with beep, sounding approximately every 2 seconds,
indicates the motor unit is activating the door and is operating
off of the SPU.
• A flashing LED with beep, sounding every 30 seconds, indicates
batteries are low.
• Once the power is restored, the SPU will recharge. This is
indicated by a flashing green LED.
RED LED:
An error has been detected and the SPU will automatically shut
off. The SPU 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.
©2009, The Chamberlain Group, Inc.
114A2745F All Rights Reserved
OPERATION
1. Test the installed SPU with the motor unit.
To test the SPU, disconnect the motor unit power cord from the
electrical outlet.
• A solid yellow LED indicates the SPU is operating on battery
power.
• A flashing yellow LED with beep indicates the SPU is operating
on battery power and that the battery charge is low.
• To test whether the SPU 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 SPU (indicates that
the SPU is now charging).
• Test completed.
2. Charge the battery.
• Allow the batteries 24 to 48 hours to fully charge before using
the SPU system.
A fully charged SPU 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 SPU
mode.
To reduce the risk of FIRE or INJURY to persons use only
Chamberlain 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
(Green LED)
(Yellow LED)
(Red LED)
