How to Troubleshoot & Replace Frigidaire AP2150133 / 5303918202 Defrost Thermostat

Not sure as to which was bad but for less than $40.00 dollars for the parts and about 30 minutes of my time I was able to replace them both. I watched both how to videos and they explained everything thoroughly and completely. I ordered the parts on Monday got them shipped to my door on Wednesday afternoon and within 45 minutes after I got them my freezer was backup and running. All for much less than the price of a service call would have been. Appliance Parts Rocks!!! In my book. 

Removed the panel at back of freezer, found that the evaporator coils were completely iced over. Removed the connectors at the of the defrost heating element, it was OK, had continuity. Decided that the problem was either the defrost thermostat or defrost timer. Ordered both parts, as they are cheap and testing the thermostat can be difficult. Also, used a hair dryer to defrost the evaporator, which allowed the refrigerator to start cooling both sections, at least for a few days, until new parts arrive. It will work until the evaporator coils frost up again. When installing the defrost thermostat, I soldered the connections and covered with shrink tubing and put silicone at the ends. New parts arrived and replaced both parts and refrigerator is working. 

I decided to order a defrost timer, a defrost thermostat and a start relay. I thought for the fifty bucks for everything why not give it a shot. I first installed the defrost timer (all of 7minutes) then the defrost thermostat (about the same except I didn't use the crimp connectors or heat shrinks and just used wire nuts instead.) It turned out that the compressor in this unit does not have a removable start relay so I couldn't use that part. Then I took a portable air tank and just blew out all the dust and dirt from the coils and cleaned it well everywhere I could. Then plugged it in and it works perfectly! It actually works better than when I first purchased it new, I always suspected something was wrong back then. It was so easy to fix with the videos and since I didn't use the start relay it really only cost about $30 dollars total to repair. Love Appliance Parts Pros! 

Defrost thermostat was bad. decided to replace thermostat,heater,and timer. 

I replaced the defrost thermostat and the fan motor. Very impressed with service. Ordered the parts Thursday night and they where on my porch Saturday morning. 

The problem was with the defrost thermostat. It was stuck in the open position. The would not allow the defrost heater to melt the build up of ice on the condenser Which over time blocked the vents that cool the lower fridge area. I simply replaced the thermostat and the problem was fixed. 

Several months ago, the freezer was so frosted, it blocked the air cavity that brought cold air to the refrigerator compartment. The result was the freezer was cold enough, but the refrigerator was near room temperature. At that time I defrosted it manually with the idea that that would correct the problem. It frosted up again. I defrosted it manually, then checked the schematic. There are three parts making up the defrost system: Timer, thermostat, and heater. I checked the heater with an ohm meter and got around 38 ohms. I concluded the heater was good. Then I bought the thermostat and timer from Appliance Parts Pros. The prices were good, and each part included a video showing how to replace the part. This was extremely helpful and easy to understand. I decided the problem was most-likely the timer and it was the easier thing to change since no wire splicing was involved. From the video, I knew exactly what to expect and what tools I needed. The change-out had no surprises other than that I learned there is access to turn the timer with a screw driver to cycle through all its steps. Doing this verified the timer was working and the defroster was now working. I did not replace the thermostat, since I could tell from the behavior of the heater that the thermostat was doing it job. The timer was an exact fit/drop in replacement. The whole replace operation took around 10 minutes, and that was because I was taking my time. 

After 10 years, the Start Device Part # AP4393517, attached to the compressor failed. I replaced it with the similar part, but not factory original and not sure if it is new from an appliance store nearby. By not being sure how long this part will last, I decided to order this part and the other parts from you, just to be on the safe side. I replaced the part myself. It was not easy to get down to the floor and a little cumbersome to remove the part because it is attached very hard to the compressor. 

First replaced defrost timer which tested OK - but reasonable price and easy to replace. When that did not fix the problem replaced the defrost thermostat and defrost heater. That fixed the problem. However all three parts tested OK ?? May have been a loose connection or intermittent problem with one of the parts. Final cost for all three parts was much cheaper than a service call!! 

Well my reliable handyman brother told me he fixed his fridge, as he had same problem. Freezer working but fridge warm. He suggested I order Defrost Heater Kit. I looked it up on your website and found part but noticed Defrost Thermostat as well. So I ordered both. Anyhow he installed the thermostat only. Fridge is cooling. We did not install Defrost Heater Kit. Gonna see if we even need to? So far so good with just the thermostat. We'll be watching to see if back wall freezes up again.