Does the aux. water pump to the heater check out OK? Other threads, including  http://www.peachparts.com/shopforum/showthread.php?threadid=15038&highlight=auxiliary+water+pump
indicate that the monovalve may be going bad, or that the pushbutton control unit is marginal. apparently a failing aux. water pump can 'use the pushbutton unit as a fuse' and kill it. If it is the aux water pump, it should be a relatively easy diagnosis. The monovalve or a combination pump/pushbutton problem could be more of a problem.  Good luck!
			
				
			
		  
		
		
		
			
		
		
		
		
		
			
				__________________ 
				John
 
2003 Firemist Red/grey leather SL 500 
2015 Palladium Silver/black mbtex GLK 350 
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
 Click to see 87 300E
			 
		
		
		
		
		
			
				  
				
					
						Last edited by JCE; 11-21-2001 at 07:43 PM.
					
					
				
			
		
		
		
	
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