Checked and cleaned vent which was in need of cleaning, but not too bad (I do not consider this a primary causal detail, but can be a problem, so clean yours). Replaced Hi-Limit Thermostat (safety thermostat) after confirming the circuit was open with ohm meter. While I was in there, I completely cleaned the heater and ducting and internal workings of the dryer. Confirmed the heater coils were good via 20ohm, 20ohm, 40ohm readings (LG service manual has wrong readings). Two weeks later, same failure happened again. So it was either a bad replacement part or something else causing the Hi-Limit (safety) thermostat to blow. If the other thermostat on the heater is not properly regulating temperature, I figured this could cause an overheat condition, so to hopefully get this to go away without turning it into a science project, I replaced thermostat on heater, thermostat on blower duct, safety thermostat on heater, and just because, thermistor assy (on blower duct). Dryer is working well for now and if I can get past a month of good operation without recurrence, I will figure this problem solved. I found that nomenclatures on these parts vary, so check the function you are trying to replace and get the correct part. Also, on LG documentation out there, the thermostat on heater sometimes has three connectors, sometimes two. Check your wiring diagram or physically look at your part to be sure to get the right replacement. I have read that you can replace the heater thermostats by removing the exhaust duct, but to me that would require some wrist gymnastics and I am sure I would drop screws and have difficulty getting the wires disconnected. Going through the complete disassembly which includes removing the drum takes about 20 minutes (10 minutes the second time around in my case). Also, going through all that makes it possible to vacuum out the inside of the dryer and all the ducting. Notes on dryer disassembly: Unplug it first and just remove three screws on the back where the top is connected and slide the top back and up. Continue on by removing control panel and bracket, door, drum roller panel, duct, drum.... Note the routing of the belt around the tension pulley and motor drive before you take it off. Watch a video on disassembly. I hope this helps.