Those Sauna chamber won't work. It says "missing requirement - empty pipes".
But there's already 50kg steam inside. And a use needs 25kg.
Of course my pipe has been emptied, by my automation system as I don't want the steam to get colder.
By the way, Saunas are full, and that's what my automation system's checking before to turn off the steam pump-in.
Try to make working steam chamber completely filled-in, but with no steam anymore into the conduit.