I have built the fusion chamber using the guidebook, but I am unable to open the menu from the fusion chamber controller even when the reactor has power. I am playing using all the mods 8.

Can't see the top in that pic, is it a solid 5x5 of plating on top as well?

Can't see the top in that pic, is it a solid 5x5 of plating on top as well?

Yes, and it gave me the notification for completing the build when I filled in the reactor with the quest book guide

Break and replace the controller

Break and replace the controller

I have tried this as well to no avail

Do you have a free block below the Fusion coils ( the yellow thing in the middle )
If YES, place a block below it even when the schematic says otherwise. IT NEEDS a block below it to work.

Do you have a free block below the Fusion coils ( the yellow thing in the middle )

If YES, place a block below it even when the schematic says otherwise. IT NEEDS a block below it to work.

Thank you this fixed it

Yeah I wish I knew why the schematic doesn't appear correctly. Might be a bug in Patchouli or a mistake on my end. If anyone has input let me know and I will fix it when I get a chance.