I replaced the thermocouple twice. It worked for several days them off again. The flame size has not been altered. In inspecting for rust it appears normal with only some discoloration of the pilot end piece. The thermocouple had been screwed a couple of turns after we saw instructions to only turn it 1/4 turn, is that the problem. If so what can we do to correct it as we have loosen it an screwed it 1/4 turn as perscribed. Please let me know your thoughts OK.