Shortly after the start of main mission “The Grave-Hoard” you will have to restore power to an ancient door.
To solve this power lock puzzle you must turn rings on wall pannels to the right position. There are 3 panels with 4 rings each.
The easiest way to see the solution is by using the Focus Device on the fuse box next to the 4 rings (press R3). It shows you the order.
Puzzle Solution #1:
Start with the panel on the lower floor with the audio log sitting right next to it. The combination from left to right is:
UP, RIGHT, LEFT. DOWN
Puzzle Solution #2:
This panel is on the opposite side of the last one, also on the lower floor. The combination is this (from left to right):
UP, UP, DOWN, DOWN
Puzzle Solution #3:
The last puzzle is upstairs. There’s only this one panel on the upper floor. The combo from left to right is:
UP, DOWN, LEFT, RIGHT
And this is how you open the solve the ring puzzle to open the door lock in Horizon Zero Dawn’s Grave-Hoard mission.