The dryer will not heat up to dry clothes

One basic reason is your washer could NOT be spinning most of the water out, therefore your clothes are wetter than they should be, thus taking longer to dry:-)

2 things are needed to dry clothes. 1 is good air flow. Check to make sure that the dryer vent is not clogged or partially clogged with lint. Also make sure there are no kinks in the vent hose. With the dryer running you should feel good air flow blowing out of the outside house vent. The 2nd thing a dryer needs heat. Check to see that the dryer feels warm to hot when you reach in to tough the clothes. It is possible that the heat element has partially failed. Another thing to investigate is how well the laundry machine is spinning out the water in the spin cycle. This spin cycle is used to get as much water out as possible prior to placing the clothes in the dryer. The wetter the clothes when they come out of the laundry, the longer it takes to dry them.

Hi, If you have a gas dryer.
The most common problem with a gas and no heat is the ignitor going bad...

Here is a tip that I wrote about that problem...

Gas Dryer not Working Gas Dryer Not Heating
http://www.fixya.com/support/r4398592-gas_dryer_not_working_gas_dryer_not

If your dryer is electric..
There could be a number of different problems...
Check out this tip that I wrote about this problem...

Dryer Troubleshooting Electric Dryer won t Heat
http://www.fixya.com/support/r3866345-dryer_troubleshooting_electric_dryer_won

heatman101

I am having the same problem on a WD9900A. The wash cycle works great. Spins fast and clothes are completely rung out. Dryer cycle heats up well. Fluffs and heats cloths. At some point during dry cycle water is injected on clothes and they end up sopping wet; much wetter than after wash. Filter is clear. Outlet pipe clear and functions well. Possible problem with dryer timer? Or washer timing kicking back on?

I am assuming that your talking about how much energy your using. When the unit runs on full heat, your electric meter will spin as you say like a top, this is quite normal. Electric dryers use tremendous amount of energy. Going on fluff your using just the normal 120v and not pulling many amps to run the dryer. However with the unit on high your pulling more amps and are now drawing 240v to operate your unit.
If your clothes are drying than it is not the heating unit.

If your concern is the amount of energy expended, there is always the old clothes line, which is energy efficient and if you live in a part of the world where the air is clean your clothes will smell fresher than if it came from a dryer.

You're a moron. This unit washes and dries. That's the whole point of it. Perhaps you should do some research before answering the question. the most likely cause is the water lever sensor.

dryer spins fine but wont heat

If your dryer spins and heats properly and the clothes don't dry, then very simply put, the moist air is not being taken away. If your drying temp is adequate, then the problem is with the exhaust. Go to where the air is being exhausted outside your home, if working properly, when you put your hand on the air coming out, it should get damp very quickly. And ALWAYS clean the lint trap after every load!!!!

Remove the rear connecting vent and try it. If it dries then, repair the vent blockage.
It not, report back as to what does happens.
Model number too.

Your heating element is going out. Mine did this a few months ago. It is an easy fix. Look up the part online.