Yep. Double-press 6 to make it happen.
You might check that you’re not spamming buttons like mad. A common mistake.
It messes up your already timing sensitive rotations by queuing presses.
As a long-time turret user: Turrets fire once (starting their firing cycle) immediately after being placed. After that, any overcharge will occur on the next iteration.
A fairly common method of use for the Healing Turret (and many other turrets) is to place them, immediately activate the Overcharge, and then either detonate or pick them up; with Healing Turret, this is especially prevalent due to the blast finish of the Detonate and Water field of the Overcharge combining to create an AoE Heal effect.
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