To save battery power the light bulbs on the garage door opener will not work when the unit is operating under battery power.
Garage door battery lights disabled.
The reason for this is to direct all energy from the backup battery to the operation of the garage door opener.
Use of the overhead light is temporarily disabled while in battery backup mode so that the battery backup does not waste power on anything other than lifting the door.
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When the power is restored all lights on the opener will operate like they did before.