If the vent line gets clogged or partly clogged, it blocks airflow through the dryer. This makes drying take way longer and the inside gets hotter. It can also cause a burning smell. To keep your dryer working right, you should clean the vent system at least once a year. Cleaning the vents prevents issues like bad smells from the dryer not venting air properly.
The blower wheel in the dryer moves air through the drum. The motor that turns the blower wheel also runs the belt for the drum. So if the blower wheel gets blocked, it could stop the drum from turning too. Check the blower wheel and housing for anything blocking it. If you see an obstruction, replace the blower wheel or housing. Replacing the part will help get the drum turning again.
A dryer's control board controls the voltage being sent to all of the appliance's electrical components. If the board is defective, it may interrupt voltage to the drive motor resulting in the drum not turning. You can inspect the board for signs of damage or a shorted component. You can also use a multimeter to test for voltage reaching the drive motor after reviewing the dryer's wiring diagram.
Too much lint build-up in a dryer can be a fire risk. The heating element can make the lint catch fire. It's best to clean out the dryer and venting once a year. Doing this helps prevent fires from lint build-up.
The main control board in a dryer controls the power going to all the parts. If the board is bad, it could stop sending power to the motor. This would make the drum not turn. Look at the board for any damaged or shorted parts. You can also use a multimeter to check if power is getting to the motor. First check the wiring diagram for the dryer. Replacing the control board can fix the problem if it's not giving power to the motor.
The door switch is like a safety guard that's supposed to make sure the dryer only works when the door is fully closed. But as it gets older, it can stop doing its job properly. When it acts up, the dryer may keep running even if the door isn't closed tightly, allowing hot air to escape. This escaping hot air can heat up things it shouldn't, like wires, lint, or even the door switch itself, causing that burning smell. What's more, when things get too hot, there's a risk of lint in your dryer catching fire, which is pretty dangerous. So, if you catch a burning smell from your dryer, it's best to have it checked out to stay safe and keep your clothes safe too.
The moisture sensor checks how damp the clothes are. It tells the control board when the clothes are dry. If the sensor is broken, it may wrongly show the clothes are dry. Then the drum would stop turning too soon. But this rarely happens. Before replacing the sensor, check the parts that often break first. If those are all working, the moisture sensor likely needs replacing. Follow instructions to remove and replace it safely. Take care not to damage the wiring. Test that the dryer heats and spins after fixing. The sensor helps the dryer know when to stop.
If your dryer drum is not starting, it's probably not because of a bad timer. That rarely happens. First check the parts that usually break. If everything else is working right, then test the timer. Use a multimeter and wiring diagram to check the timer. If the timer is bad, replace it. But again, the timer is not likely to be the problem if the drum won't turn. Look at the other parts first before replacing the timer.
The control board uses moisture sensor bars to check how damp the clothes are. These bars can get coated over time, especially from dryer sheet residue. Try cleaning the bars with warm soap and water. If the sensor bars are damaged, they need replacing. Follow instructions to remove and replace them safely. Handle the bars carefully when cleaning. Damaged bars give wrong readings. Cleaning or replacing fixes this. The bars help the dryer know when clothes are dry. Keeping them clean makes them work right.
Plug in the dryer cord. Or check that the house power is on at the outlet and circuit breaker. Make sure the dryer is getting electricity.
Many dryers have an anti-wrinkle setting. Choosing this makes the drum tumble the clothes a few minutes after drying ends. This helps prevent wrinkles. If this setting was picked by mistake, the dryer will keep turning on until the clothes are removed. Check the settings next time. Make sure anti-wrinkle is off if not wanted. Tumbling after drying can help clothes stay smooth. But the dryer will keep running until you take the clothes out.