I took them both out and checked them. It is a PITA, but that is the only way to manipulate the float and check the resistance of the unit. I can't remember what the resistance is supposed to be. I have the 202 CD but it won't run on the latest Windows update so I can't access it for you. My guess is one of them will make sense and one won't. On mine the problem was in the connection between the resistance winding and the pins on the plug connection. There was an open. Kinda weird since it is all encased in plastic.