How to Troubleshoot & Replace Samsung AP4201898 / DC47-00018A Dryer High Limit Thermostat

Replaced the high-temperature thermostat. 

I watched a YouTube video on this model. This dryer is now 7 years old. I had already replaced the belts and drum support wheels 3 or 4 years ago due to excessive noise. The video indicated that the cause of heat failure was most likely due to a burnt-out heating coil. The coil was easy enough to access and sure enough, it had a break in it along with a fracture in the steel plate the coil is mounted on. I knocked the cap off of the high-limit thermostat when I was removing the wires so I replaced that also although it still worked fine. Dryer is now fixed and I continue to have a success rate of 100% in repairing all of our newer appliances in a new kitchen, thanks to AppliancePartsPros.com. Our exhaust pipe is a 5' flexible aluminum pipe, clean, and vents to an outside wall. 

While looking up information on cost for a part I found video on your website. A true blessing. I figured if I could take apart I could get it back together. I am a retired Medical Assistant going on 68. It was very easy whenever I wasn't sure about something I just rewatched the video. Thank you so much, It work's great. Diane 

I ordered the three safeties I found on a parts diagram. Removed panels, bulkhead, drum to access heat pack. Blew out heater coils, cleaned all lint from around drum. Replaced safeties and the unit started back up. 

I replaced the high limit thermostat and the thermal fuse, although I didn't suspect it was the problem after changing the heating element, it was the next step other than the thermistor. During this time I went further into cleaning and took off the cover for the blower and discovered several pieces of lint probably knocked loose from the previous element change stuck in the blower that was probably hindering the air flow, thus overtemp. Although I had the tools and expertise, the new thermal fuse did not come with the mounting bracket. The old thermal fuse was pop riveted to a mounting bracket, so I had to drill out the pop rivets and find either small pop rivets or I used small screws for the replacement mounting. 

Changed out the High Limit Switch and Thermistor. Used the video as a guide. 

Replaced the heating element and the thermostat. The video was excellent. 

After watching the super helpful AppliancePartsPros.com videos, I ordered the parts and received them in short order. A couple of quick refreshers from the videos and Voila! Our drawer was working as expected!! Thank you!! 

I followed the directions with a video or two. It ended up being the heating element, but I purchased the thermal fuse and high-limit thermostat just in case. The whole thing took about 1.5 hrs. That includes finding out my multimeter needed new batteries, etc I’m a 49 yr old woman who is a bit handy. My teenagers helped for a few minutes taking it apart and helping me get it back together; otherwise I did it alone. It was easy. So glad I didn’t pay a repair person! 

Replaced the Heating Element and the High-limit Thermostat. Used the video that explained the process and it was easy to follow.