Instructables

Step 8: The electric clothes dryer does not dry.

Picture of The electric clothes dryer does not dry.
The wet clothes in your dryer are still wet after running for the full cycle. The drum turned. The dryer went full cycle. What could be wrong? First check for a clogged filter or vent pipe. If those things are good, the problem may be electrical, and a multi-meter can help you find and fix it.

Dryers operate on two different circuits at two different voltages. The motor that turns the drum works on 115 volts. The heating element works on 230 volts. The electrical outlet behind your dryer that powers the dryer looks like this. 

Set your meter selector to 400 volts AC. Put one probe into the "A" slot. Do not touch the other probe, but insert it into the "B" slot. The fit may not be tight. You may need to wiggle the probes to touch the metal inside and get a reading on the meter. The meter should show 230 volts. "C" is the neutral wire. "D" is the ground wire. Place a probe into "A" and the other probe into "C" or "D" and the reading on the meter should be 115 volts. The same should be true of a reading between "B" and "C" or "D." If you do not get these readings, check to be sure one circuit breaker or one fuse is not blown. There is the possibility that the dryer's heating element could be burned out, but that is not as likely. You can access it from the back of the dryer. Remove a cover over its terminals. Be sure the power to the dryer is disconnected. Use an Ohms setting on your meter and check for an open circuit. Testing an oven element in your stove is very similar. Remove the screws that hold the element in place and pull it from the oven. Do a resistance check on the two terminals.

(The photo is from Bing Images.)