Jordan R for Model Number DV350AEW/XAA-0000 My heater coil burned open a few months back. I replaced it and about six month later, it burned open again. I replaced it and a couple of weeks later, the thermal cut off opened (wiring diagram refers to it as TH3). I replaced it and the thermistor. A couple of weeks later, the thermal cut off has opened again. Blower motor is working fine and there is no build up of lint anywhere. Plenty of air coming from the vent outside the house. What else could be causing the dryer to overheat". The answer was a stuck relay on the main PCB might be causing it. I have replaced the board and still operates the same. I checked the output voltage at the relay on the board (going to the heater) and it stayed between 120VAC to 122 VAC for the 10 minutes I ran the dryer (dryer was producing heat). Shouldn't the relay open and close the circuit to the heater during the cycle? What else could prevent this from happening?
Answer Jordan, You will want to check the wiring between the control board and the thermistor and between the heater and control board to ensure that there are not shorted or damaged wires. Read More... Answered by AppliancePartsPros.com | Monday, May 2, 2016