How to Troubleshoot & Replace Ge AP2061695 / WR9X489 Defrost Timer

I got the correct part numbers off of the Technical Data Sheet attached to the bottom of the refrigerator, watched the online repair videos to ensure I knew of any gotchas, then quickly and easily replaced the parts. I didn't do much in the way of diagnostics so I replaced the heater bracket, thermostat and control units all together as they were all ~ 16+ years old. Note that the WR51X10029 already includes the thermostat (WR50X0122) so no need to purchase the thermostat separately if you buy the heater and harness kit (also, no splicing, heat tubing required). 

Replaced defrost timer and also changed out the condenser fan motor. All told it took 30 mins for both. 

Replaced the heater element and defrost timer. 

Ordered the Defrost Heater Kit and Defrost Timer from Appliance Parts Pros. The parts were installed and it works great now! I have ordered from them before with great results and very appreciative of their expertise and help in obtaining the right part for my refrigerator. I am very happy with the company and the parts!!!! 

Correct assessment from the FAQ section for my issue....great video on repair....ordered products and arrived on time....completed repair and saved me A LOT doing it this way. And it WORKED...thanks to all 

Took out the old defrost timer and check it with my oms meter, showing good. so then I took out the defrost heaters and the defrost thermostat, wired all together as one component. check with oms meter. showing one good and one bad. That way i was able to know it was the correct part. so my wife ordered the parts on line from appliancepartspros, gave them the model no and the part numbers we found on line. she check them with the model no, they were the correct parts. I went ahead and ordered the defrost timer also since I already had it out. we had the parts in about 2 days . I installed all 3 parts plug it in and now it seems to be working fine. will let it run for at least 2 weeks and make sure it is working properly. 

I Removed the back inside panel of the freezer. Frost was all over the evaporator. The defroster heater was not working. I ordered the defrost timer and defrost heater. I bought both to be sure I didn't have more than one failure point. The frig is 18 yrs old so I figured I'd be sure i don't have this problem again. After allowing time to melt all the frost, I replaced both components. Surprisingly easy. Replaced both components in about 30 minutes. 

Called a repairman and he had to order parts. I waited 4 weeks while calling his office every week. Always the same story that the part would be received next week. I was finally told that the part order was cancelled. I got online and found appliance parts pro online. I ordered the part and it arrived the next day. I will still have my service guy install the parts even though appliance pro parts said that it was not that difficult and offered to walk me through it. The next time I have an issue I will call service pro and do it all myself with their replacement parts and expert sales and service. Definitely recommend and will use in the future. 

Replaced the defrost timer and heaters. 

Replaced the defrost timer. Will need more run time to see if this truly fixed the problem but the refrigerator is running and cooling at this time.