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So these dryers monitor a clogged vent by checking the temperature. First, disconnect the vent from the back of the dryer to make certain that the vent isn't an issue. If the dryer still won't run properly then you know there is a problem with the dryer. If the dryer does run, then you know the vent is either partially clogged or just too long for the dryer.
Now, let's assume the vent isn't a problem. You would need to remove the back sheet metal cover panel in the center on the back of your dryer. Unscrew and remove this panel to expose the heater. There is a thermostat with a reset button mounted to the side of your heater. Be sure the dryer is unplugged and push the button. If you push it and it clicks, then the problem should reset. If it doesn't click, then you would need to test continuity through the heater to make sure the heater has continuity and if not replace the heater. If the heater does have continuity then you'd want to replace the thermistor sensor which regulates the heater.
One last thing since the dryer is new to you. This dryer is designed to stop the motor and reverse directions quite often in the beginning of the cycle and a bit less often later in the cycle. The dryer doesn't actually try to heat until it's been running for about 3 minutes.
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I apologize about the circumstances but I do hope you can get the issue resolved sooner rather than later.