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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
That sounds like a loose connection or a bad ground. I would call Tiffin and see if they can supply some wiring diagrams of this and we can track down where to look first.
I show your question has a valve of $29 total. That is the same price no matter how many exchanges it might take. A lot cheaper than a trip to the shop and much faster.