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

Yes. Since I was replacing the heating element I decided to replace the fuses and thermostat. I ordered and installed the parts I purchased from Appliance Parts Pros and the dryer works great. 

Replace thermostat. Replaced all sensors just to update all components in the dryer. 

A month ago I replaced the heating element in a Samsung Dryer, everything was working great, then it stopped heating again. I disassembled the dryer again thinking g the heating element had quit working again. After takining it apart again I found the element be still intact and okay. On the side of the elheating element housing are two other parts (1) the thermostat and (2) fuse assembly. I noticed the fuse assembly had a melted spot on it. I used a multimeter to check the contunity found it to be open. I replace the fuse assembly and went ahead a replaced the thermostat. I also replace the vent hose due possible airflow restriction. Put everything back together and dryer is working great. I am going to check the vent hose monthly, and keep it clean and free of any debris which will help with airflow and keep the parts working properly. Hope this helps. 

After watching several videos on You tube, I decided to diy repair. Originally, I ordered a complete heater assembly from the Samsung support parts system. After 10 days, they could not deliver, so I cancelled and ordered from Appliancepartspro.com. They did not have the complete assembly either, but did have the heater element and the two thermostats available and I reused the original housing. I also ordered a new drive belt since I was going to be tearing down anyway. I received the parts in about 5 days. Tear-down and assembly went pretty much as shown in the videos. There were a couple things I did a little different. First, at tear-down I marked the 6 wires connected to heater and thermostats with numbered tape tabs. I don't know how important their exact location is, but this way I was sure. Secondly, I am old and working on the floor is not so easy. So after moving the upper panel and removing the front panel, I replaced the 2 screws at the rear of the upper panel and secured the front of the upper panel to the side panels using Guerrilla Tape. Then I tipped the machine on its back using a piece of lumber or rug to protect the back. This made access to the remaining components a snap. Whether lucky or good, it fired up first try. Now wife's hero again! 

I went ahead and replaced the element, thermal fuse and dryer thermistor. I feel like the thermistor is the only part that went out (never fully diagnosed - but it rattled bad), but it all was in the same area and easily replaceable. One note, the OE Thermal fuse is attached to dryer bracket w/rivets. You'll need to drill those out and either reattach the same way or find small screws. Everything works as factory now. Better to spend the $148 (includes shipping) now on all of this than the $500-600 on a new dryer only after 3 years. If you can use a screw driver, you can replace these parts...it was very easy. I took the time and completely removed the lint basket, and all the other pieces and completely cleaned out the machine of all lint...even made $.30 off the deal from loose change! 

First and foremost, if you don’t have a multimeter you should buy one before buying a single part. When the Samsung has no error codes and won’t heat, there could be a number of things wrong and you need to open the dryer up and start testing. Google search for videos on how to take apart your dryer. My Samsung wasn’t difficult, just time-consuming as the entire thing had to come apart to access the fuses and whatnot. Long story short, a fuse tested bad. I changed the fuse and the high limit thermostat too because a Google search suggested they could fail together. Put it all back together and back in business. Other advice: wear gloves. The sheet metal in a dryer is sharp. Oh and clean out the dryer while you’re in there. And test every part so you know what to buy! 

Using the video here I was very easily able to take my dryer apart. I thought it would be much harder than it was. There really isn't much to a dryer once you get inside and even the wiring is pretty much foolproof to put back where it goes. 

Repair went good replaced heat element plus thermostat and thermal fuse dryer thermostat dryer thermistor. So far all is good good heat working properly. Took a couple of hours. Videos were great resources saved a bunch of money. Remember to take picture of wire connections. 

Replaced the part 

I replaced the thermistor. Very easy to do. Works perfectly now. Saved about $450 in service call.