I bought a dryer from someone recently and when I hooked it up it will run for about 4 min and then shut off for about 6 min and then start up again for 4 and so on. The dryer is getting too hot and shutting itself off. There is nothing wrong with the dryer it's the vent hose that leads to the outside of the house. When the hose is on is when it gets too hot and shuts off but if you take the hose off it will run its full cycle. I have made sure that the hose is free of lint and the vent is clean also. From the dryer to the outside is only about 3 feet so I can look in the hose and see there is nothing blocking it and I can reach my hand from the laundry room out the vent to the outside so I know that is clean. I held the flaps wide open on the outside of the house and it still shut off after about 4 min. I don't know if I need to make the vent on the outside of the house bigger to allow more air out but the air is getting backed up somehow, any ideas?
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Check the exhaust pipe for a clog. Outside of the machine by the vent you should feel the rush of hot, moisture laden air coming out. When the hot exhaust does not leave the machine as intended and collects, raising the temperatures inordinately and causing it to overheat and shut down.
U might try bypassing the temp limiter sensors to see if unit continues to operate.
Inside the back and the bottom of your dryer are several ( From 2 to 6 ) "overheat thermostat switches". One of these is doing it's job really well. These are designed to prevent your dryer from overheating and catching fire. I suspect one of them is failing, and needs replacement. Someone handy with electrical testing tools and mechanic's tools need to take it apart and check these to find the "bad" one. While they have it all apart, it should need a really good cleaning inside. Be blessed.
Likely causes, in order of probability are: 1) Heating element has broken in two, needs replacement.. 2) A "overheat shut-off thermostat" has clicked open, needing replacement. 3) A wire (likely near the heat element) may have burnt in two, need a repair. 4) A wire in the connection at the back of the machine where the electric cord is hooked up may have failed, needs repair. 5) A circuit breaker in your "fuse box" may have tripped, needs reset. If you wish to attempt repairs yourself, you'll need tools, a testing meter, and a plea to "fixya" could cause someone to give you step-by-step instructions. Be blessed.
Does it shut down completely? If it does, and the timer ceases turning, your problem may be a blocked vent pipe or Lint buildup.Your high limit switch is designed to kill power to your heater coils and sometimes the motor in case of overheat.
You probably need to clean your dryer vent. Dryer vents should be cleaned every couple of years to prevent them from being clogged with lint. You can check the air-flow by going outside where the vents terminate. What's probably happening is on sensor dry, there's a moister sensor that tells the machine to shut off when there's no moister. The hot is is being pushed back into the dryer and confusing the sensor. That's why it's working on timer dryer because that option bypasses the moisture sensor.