How can I check that my current drain heater is actually working or in operating condition, and that there is not another problem occuring? This is in regards to my fridge heat exchanger freezing over with ice periodically.
If the lines coming out of the back wall of the refrigerator and going to the evaporator are icing up and the evaporator icing up then the drain heater would not be the issue. It sounds like an air leak or the thermistor for the defrost that may be at fault.
Freezer side keeps building up with ice and temp light keeps blinking.
Answer Hello Noel. It sounds like you may have a defrost problem with the unit. Check and see if there is any frost build up on the back wall of the freezer. If so, you will need to test the the defrost thermostat DA47-10160H. It should read closed for continuity when cold. You can test this with a multi-meter TJMA-DMT3. I will include a link at the end to assist you how to use the multi-meter if needed. If the thermostat is good, you will need to replace evaporator assembly as the heater is built into it on this model. If the problem still continues, replace the defrost timer (Control Board on this model). Once the problem is repaired, you will need to thaw out the ice on the coils before the unit will operate properly. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html