RT18DKXHW00 Roper Refrigerator

I troubleshot the problem by reading the electrical schematic and concluding the heating elements (defrost cables) were either defective or the bi-metal temp sensor was open. When closed the temp sensor completes the circuit for the current to flow through the heaters to defrost the cooling coils every 8 hours and then when the bimetal o ... Read more pens at 55 degrees the circuit is open and the coils are cooled because the refridgeration motor is in run mode. A timer between the motor and heater elements also was defective. The timer controls the cooling period and the defrost period. I ohmed out each part according to the spec sheet of normal resistance of parts and thus the bimetal and timer were defective. I gather a surge of some duration and amplitude affected these parts because a storm 24 hours prior to refridgerator problem had passsed through the area and the AC electrical power had oscillated several times during that event. I used hand tools to do the repair. If you are not mechanically inclined a step by step proceedure would be moot. It is a matter of disassembly and assembly paying close attention to fragile parts.

My refrigerator is approximately seven years old (date of manufacture: 2001). I had come home twice in the last month to find that it had not been running for several hours (ice melted, milk spoiled, etc.) but it would start running again if I twisted the thermostat knob. So, I ordered a new thermostat. First I removed the 1/4" hex scr ... Read more ew that held the plastic thermostat housing in place (it screws up into the top of the refrigerator compartment). Then I removed the plastic thermostat knob and slid the old thermostat out of the housing. I then disconnected the wires one-by-one from the old thermostat and connected them to the new one so I could be certain they were all connected correctly. Finally, I pulled the plastic sheathing off the old sensor wire, slid it onto the new one and popped the wire back into place. Slide the thermostat back into the housing, screw the housing back into the top of the refrigerator compartment, replace the plastic thermostat knob, and the job is done.

I used a flat-head screwdriver to pop out the old light rocker switch. Then, I unplugged the wires, plugged them into the new light rocker switch, and then popped the new switch into the hole. That's it! Lights began working again.