The steps
From the Steam thread "how to replace fuse?":
- Search chests and lockers across the map
- Pick up one of the fuses — there are usually two on the map
- Bring it to the broken elevator
- Hold it in your hand at the broken slot and it will install
- Feed the elevator 40 coins, then leave
Two things people get stuck on:
The fuse has to be in your hand. You do not use it from the inventory — it needs to be the held item when you reach the slot.
Fixing the fuse is not the last step. One player spelled out the full sequence: "find it, bring it back, connect it, shove in 40 coins and leave." If the elevator still will not move after the fuse goes in, you are short on coins.
What a fuse looks like
"The fuses look like an old light bulb and can be put in your inventory, and they normally spawn in chests or lockers."
An old light bulb. If you have been ignoring bulb-shaped pickups, that is why you cannot find one.
There are normally two, and there is a reason
From the elevator symbols thread:
There are usually two fuses on a map, in case one falls into a pit.
So a fuse dropping somewhere unreachable is not a run-ender by design. Look for the second one before you write the run off.
⚠️ If a fuse in a chest will not pick up, that was a bug
This one caught enough people that the developers shipped the fix twice.
- Patch 1.01 (8 August 2026): "Fixed a bug where you could not pick up coins or the fuse in some boxes in the deep layers."
- Patch 1.02 (9 August 2026): "Double fixed a bug where you could not pick up coins or the fuse in some boxes in the deep layers."
Their wording, not ours. If you are on a current build and a fuse in a chest still refuses to be picked up, that is worth reporting — it is a known failure mode that has already been patched twice, not something you are doing wrong.
Why this exists
The Fuse is one of the elevator run modifiers — the symbols that appear before a descent set the rules for that run, and a Fuse run means the elevator needs repairing before you can leave.
You do not choose these. You read them and adapt. The rest of the symbols, including the two nobody has decoded, are on the elevator symbols page.
Party split for a Fuse run
With two fuses on the map and a group, the obvious division of labour is to send people to sweep chests and lockers in parallel rather than searching as a pack. We have not found a source describing an optimal split, so treat that as reasoning, not documented strategy.
What is not confirmed
- Whether two fuses always spawn, or "usually two" means it varies
- Whether fuse spawn locations are fixed per seed or fully random
- Whether a failed Fuse run has consequences beyond not extracting
- Whether the 40-coin figure is fixed or scales with depth