There are a couple things in your two posts that make me think your board is bad. They are interconnected. First you said runs a few minutes then off, second, no click when you turn it on.
It is true that a failure of the sail switch can cause the first but the no click is the board.
You did not say anything about the heater trying more than once when you turn it on. Usually the heater will try three or four times and then shut down completely. The board also turn on the propane, do you smell any propane?
You are on shore power so low DC voltage shouldn't be a problem but you should check that before going any further.
Just stuff I learned here on the Forums.