A liquid discharge device includes: a tank including a second liquid chamber connectable to a cartridge having a first liquid chamber storing a liquid; a head; and a controller configured to: discharge ink from the head based on a recording instruction; receive a second signal from a liquid level sensor when a position of the liquid level in the second liquid chamber is less than a predetermined position after the ink is discharged based on the recording instruction; after receiving the second signal, determine whether the cartridge is installed in an installation case; based on determining that the cartridge is installed in the installation case after receiving the second signal from the liquid level sensor, accept a maintenance process; and based on receiving the first signal from the liquid level sensor, perform the maintenance process.