There are many things that can cause your dryer not to dry properly. In this post I will discuss some of the science behind the dryer and some reasons why a dryer would not be heating properly.
The drum when working properly, acts like a sealed chamber where warm air comes in from a heat source. The drum rotates tossing clothes over the incoming warm air. The blower wheel sucks the warm air out of the dryer, through the vent to the outside of your home.
One thing that can cause your dryer not to dry clothes property are the seals on the drum. It’s common for older Whirlpool dryers to have a seal that looks a bit dry rotted or even burnt. The seal can even be crumbly. This rear seal is allowing cold air to come into the drum and the warm air to escape out. Think of it like having your kids leaving the door wide open the middle of winter. Cold air is coming in, your heat is going out, and the electric bill is going up. A similar cause of a long dry time is a broken door catch. You may have a dryer that is completely missing the catch. (I circled the door catch in the picture of above to help identify it.)
Another cause of long dry times/low heat is a clogged vent. Whirlpool dryers tend to get a lot of lint stuck in the chute. If you suspect that you might have a clogged vent, you can determine where the clog is by taking the vent off the back of the dryer. If you aren’t getting strong hot heat, clean out the chute.
The vent from the dryer to the outside of the house can also be clogged. You can test this by first off taking a look at the venting while it is unhooked from your dryer. Secondly, put the vent back on your dryer and go outside to see what kind of heat you have coming out that end. If the heat and pressure is significantly different from what’s coming out of the back of the dryer, you may have to get a Lint Lizard in there.
Many Whirlpool dryers use a valve coil system. When valve coils are starting to go out, they will heat up at first, but then eventually stop opening not allowing gas to the igniter. Eventually the valve coils will stop working all together.
Click here to learn how to open up your Whirlpool dryer cabinet. I hope this post was helpful to someone out there. Feel free to post questions below.