Timer, Defrost

Mike for Model Number KTRI18KBAL00

Answer Hello Mike. Based on the information you provided, it sounds like the unit is sticking in the defrost cycle. You may need to replace the defrost timer 4388931 if so. 

Rudetemp

Answer Hello Rudetemp, The exact differences are only known by the engineers who designed them. Since they are not interchangeable as they are not listed for any of the same models, they will have to have different defrost characteristics, especially since one is listed for larger cubic foot displacement units. This means that the duration between defrost cycles and the length of the defrost cycles have to be different because of the difference between the sizes of the units they are designed for. These type questions are best asked to the manufacturer who designed them. They are not interchangeable. 

Boomer for Model Number rt18bkxkq00

Answer Hello Boomer. Yes, if the board is not sending power to the fan motor, replace the defrost timer 4388931. 

T G for Model Number rt18bkxkxq02

Answer TG, First determine if the compressor is or is not running. Move the fridge out so you can get to the back of the unit and unplug the power cord and remove the lower compartment cover(if present) for a few minutes. visually check the wiring to the compressor and start device When you plug the power cord back in you should be able to hear and feel the compressor start, or you'll hear a rather loud "click" noise from the overload protector on the compressor. I take for granted you have checked the back wall of the freezer compartment for a frost build up. If the compressor does start and run, we need to suspect a loss of refrigerant. If it makes the loud click noise, we have to suspect a bad start device or compressor, if it doesn't start, we have to suspect a bad cold control or defrost timer. Thanks