How did you add wood and coal as a fuel for the furnance.
When i do ctrl+f i got : no rocket fuel!

I had the same problem start immediately after my first time playing around in sandbox mode for a little bit

Same here :( any solutions?

Yes in the settings folder inside the mod - look for a file called "vanilla-sets.lua"

The values for some weird reason for boilers, furnaces etc. are all set to "fuels-high" change this to "fuels-all"
IMHO the only values that should be fuel-high are devices that get benefit from higher value fuels such as locomotives, tanks, cars.

OK, I'm having a similar problem with turrets. Place a turret and it wants uranium rounds! I haven't even research AP yet!

This is only a display bug, If you don't have any ammo that is assigned to go into an entity it will list the highest rated type when it says no xxx ammo/fuel.

Additionaly some machines do not have wood on the list of allowed fuels

New player here,
Tried using this mod and it's still saying "No rocket fuel" when trying to build new or refuel an old stone burner. Tried changing "fuels-high" to "fuels-all" values in "vanilla-sets.lua" as described above but with no luck. Please let me know how can I fix this. Sounds like a great mod that I would love to use. Thank you!))

Edit: After a while, I figured my original problem out. I only had coal on my quick access bar but not in the inventory so it could not find any. Once I had extra in the inventory it began to work just fine.