A liquid discharge apparatus for discharging a liquid to a medium, comprising: a head unit including: at least one liquid discharge head; a fill tank configured to store the liquid to be supplied to the at least one liquid discharge head; and a drain tank configured to store the liquid recovered from the at least one liquid discharge head; a main tank configured to store the liquid to be supplied to the head unit; a pump including an inlet and an outlet and configured to feed the liquid from the inlet to the outlet; a first flow passage including a first end connected to the main tank and a second end connected to the inlet of the pump; a second flow passage including a first end connected to the outlet of the pump and a second end connected to the fill tank; a fourth flow passage including a first end connected to a second branch point as a branch point for branching the first flow passage and a second end connected to a third branch point as a branch point for branching the third flow passage; a fifth flow passage including a first end connected to the main tank and a second end connected to a fourth branch point as a branch point for branching the second flow passage between the first end of the second flow passage and the first branch point; a first valve which is arranged at a portion of the first flow passage disposed between the first end of the first flow passage and the second branch point; a second valve which is arranged at a portion of the second flow passage disposed between the first branch point and the second end of the second flow passage; a fourth valve which is arranged at a portion of the fourth flow passage disposed between the first end of the fourth flow passage and the second end of the fourth flow passage; and a fifth valve which is arranged at a portion of the fifth flow passage disposed between the first end of the fifth flow passage and the second end of the fifth flow passage, characterized in that a third flow passage includes a first end connected to a first branch point as a branch point for branching the second flow passage and a second end connected to the drain tank; and a third valve is arranged at a portion of the third flow passage disposed between the first end of the third flow passage and the third branch point. a head unit including: at least one liquid discharge head; a fill tank configured to store the liquid to be supplied to the at least one liquid discharge head; and a drain tank configured to store the liquid recovered from the at least one liquid discharge head; a main tank configured to store the liquid to be supplied to the head unit; a pump including an inlet and an outlet and configured to feed the liquid from the inlet to the outlet; a first flow passage including a first end connected to the main tank and a second end connected to the inlet of the pump; a second flow passage including a first end connected to the outlet of the pump and a second end connected to the fill tank; a fourth flow passage including a first end connected to a second branch point as a branch point for branching the first flow passage and a second end connected to a third branch point as a branch point for branching the third flow passage; a fifth flow passage including a first end connected to the main tank and a second end connected to a fourth branch point as a branch point for branching the second flow passage between the first end of the second flow passage and the first branch point; a first valve which is arranged at a portion of the first flow passage disposed between the first end of the first flow passage and the second branch point; a second valve which is arranged at a portion of the second flow passage disposed between the first branch point and the second end of the second flow passage; a fourth valve which is arranged at a portion of the fourth flow passage disposed between the first end of the fourth flow passage and the second end of the fourth flow passage; and a fifth valve which is arranged at a portion of the fifth flow passage disposed between the first end of the fifth flow passage and the second end of the fifth flow passage, characterized in that a third flow passage includes a first end connected to a first branch point as a branch point for branching the second flow passage and a second end connected to the drain tank; and a third valve is arranged at a portion of the third flow passage disposed between the first end of the third flow passage and the third branch point.