Blocked air vent. Check where the vent exits to the outside, as usually condensation builds up on the "bird blocker" which attracts dust, which attracts condensation, which attracts dust... etc.
Gas valve coils. The gas valve is opened by two electromagnetic coils. When they start go go bad, they will open the gas valve in the beginning of the cycle, then as the current heats them up, they will quit working, and you will lose heat partway through the cycle.
Igniter. The gas is lit by an electrical lighter similar to the cigarette lighters cars used to have. If the igniter breaks, then the gas valve coils don't turn on, and you get no heat at all.
Testimonial: "this is a great start for me however i would like to know where the gas valve coils is to see if it needs to be replace."
Almost forgot. If your dryer vent turns out to have been blocked, and you unblock it, and you still are getting no heat, then your thermal overload fuse probably broke, due to the fact that heat wasn't escaping fast enough. It is a safety device to prevent fire.
There are a few other things, but those are the best 1,2,3, (4) checks
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SOURCE: Dryer does not get hot enough to dry clothes Roper REX4634KQ1 Electric Dryer
If your element is operating and drawing about 20 amps when on, your problem may be the thermostat (temperature dial) or the moisture sensor (if applicable). My dryer has 2 heating elements.
SOURCE: Dryer takes too long to dry my clothes
My dryer has been taking longer and longer to dry my clothes. Sometimes it takes multiple cycles before the clothes become dry. They seem to be getting warm, but are not drying as quickly as they use to.
SOURCE: samsung dryer is not drying and its new
It ended up being a easy fix. Our old dryer was working fine and had been ran an hour before I hooked up the new Samsung dryer. Therefore I assumed when the new dryer did not work there had to be something wrong with it. There ended up being nothing wrong with it and it was my dryer vent. It was barley plugged which caused it to not heat up properly. I was told that the new dryers have a lot more sensors on them and its very sensitive about needing a clean vent to vent out the heat. My vent was not very dirty, but it had just enough build up of lent in it, it caused the dryer to not vent properly and it would keep shutting the flame off. Blew it out with my leaf blower and now it heats up and dry quick. I hope this helps
SOURCE: LG TROMM Front Load Dryer / Not drying clothes
check the vent or condensor depending on what type of dryer.
SOURCE: dryer gets hot but wont dry clothes
should the top of my 10 year old Maytag dryer feel almost hot to the touch
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