After consulting your linked schematic, and BRS's install video, I think I see the problem. I installed my check valve after the auto shutoff valve. I would have thought that it would work anywhere inline on the clean water line. But now I see that has no way of stopping the waste water {slaps forehead} 
Thank you for the info. 
I am off to tear it down. Wish me luck 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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