How do you test the ADC board to tell if it isn't working?
Answer Hello Cathy. If the unit is not defrosting and the heater and thermostat are good, then the ADC is bad and will need to be replaced. You can test this with a multi-meter TJMA-DMT3. Here is a link on how to use a multi-meter. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html
The water filter freezes every couple of days so need to shut off the water to fridge and let defrost then it works for a couple more days then freezes again what is the problem ? I've been told that the defrost might be going out, can any one help with tis problem
Answer Gary, Your issue is more likely a malfunctioning "Auto Damper" 241600902. If the damper door doesn't move properly, if it gets stuck open or partially open, the air is circulated and blown in the direction of the water filter and the filter will freeze. The ADC board 5303918476 is a possibility, but not the first option with your type complaint.