Well, I asked you two questions, so I’m not sure which one you’re answering.
Let me start over –
We normally can tell what is being controlled by a board by looking at the inputs and outputs of the board and the component(s) it’s controlling.
What is coming from the heater pcb to the heater?
(Note – the answers to question 9 are line, neutral, ground, none of the above, or impossible to tell from the information given, so that’s what I’m looking for from you.)