DLE7150W (00) LG Dryer

I actually went to mr fix it on u tube. Great instruction on how to take dryer apart. First I unplugged the dryer. I found I could reach the heating system by removing the lint tube in the back of the dryer. I put my I phone with the light on inside the back of the dryer and tested the connections to see if all were working. The thermal f ... Read more use was not working. I removed the two wires , red on top and white on the bottom. Then used a small Phillips screwdriver to remove the two mounting screws and removed the fuse. I then used a vacuum to clear any lint from the back of the dryer and inside the dryer. This took me about an hour and a half. I did it this way because I did not want to disassemble the entire dryer to get to the components. I received the fuse in 3 days and tested it. It was fine. I then put it in the dryer screwed it in place, connected the wires. Replaced the lint tube. This took about 10 minutes. Dryer is running great.

I unplugged the dryer and disconnected the vent.
I pulled the dryer away from the wall so I had room to work on it.
Pulled the top cover off (slides back).
Took the door off
Took the front adjustable feet on the bottom off
Unscrewed all of the face screws on the front of the dryer
Took the two screws off of t ... Read more he back of the control panel holding the control panel to the metal frame.
Gently pulled on the control panel to reveal 4 screws under the control panel to be able to take the front cover off.
Pulled the front cover off (the dryer door front cover).
Pulled the dryer vent cover off (two screws).
I could now see the heating element with sensor/fuse (right side).
Did a continuity test (beep) on all visable sensors/fuses on the heating element. No beep on the thermal fuse (used website diagram to locate parts to test and replacement part numbers).
Got the part after about a week, tested the parted (it beeped), replaced with new part and put dryer back together, plugged in and the dryer heated. Problem solved.

The first thing I did was locate a copy of the Service Manual (not the User / Owner Manual). After looking at that and looking online I learned that there is no sensor for the Flow Sense feature itself. The Flow Sense doesn't detect a blockage. It detects excessive heat and the manufacturer has simply concluded that too much heat is most ... Read more likely caused by a blocked duct and then it activates the Flow Sense safety feature: cutting off the heat source. Since I knew it was a heat problem I figured I'd get inside and check the two thermostats and the igniter. Igniter was fine, one thermostat was fine, the other one - the High Limit Thermostat - was giving inconsistent readings. I replaced it. Here's how: First I took the dryer apart. This is a little time consuming. There are a lot of parts that need to come out. I recommend that you put the screws in small baggies with a note as to where you took them out of so that you know where they go when you put it back together. You need to remove part of the back, the top and the front. I removed the electrical box because that is what is shown in the manual but I'm not convinced that I needed to. See if you can get the rest of the dryer apart without removing it but if you have to remove it it's not that big of a deal. It's a little tricky to detach the wire harnesses is all. And extra steps, of course. I did not remove the drum. Instead I just reached inside with the front off and pulled the wires off the thermostats to test them for resistance with a multimeter. It was kind of a pain and a little awkward but I did not want to mess with the drum tensioner. Once I figured out that the High Limit Thermostat was the likely culprit I removed it - which required a very short Phillips head screw driver and some patience since I could not actually see one of the screws. But all good. Just remember which wire goes on which terminal. Make a note for yourself: gray back / red front - something like that. Then I ordered the part and installed the new one and rebuilt the dryer in reverse from what I did.

Now, here's the thing: I actually did two things: aside from changing the thermostat I also thoroughly cleaned out the dryer. Somehow a lot of lint built up in there - no idea how since it all appeared to leave the dryer through the vent. but there must be some small gap somewhere. I cleaned everything including the flame detector. When I put it all back together it worked but I'm not 100% sure that the thermostat was bad. It's at least possible that all the lint and dirt was messing with the way the thermostats behaved. So what I would recommend, if you have this problem, is to clean it out first and then put it back together enough to run it and see of the heat comes on. It will take maybe 30-60 seconds for the heat to come on while the igniter lights. If not, go ahead and replace whichever thermostats or other parts you think are broken.