The following link explains how to troublshoot a dryer no heat problem:
http://www.fixya.com/support/r630242-dryer_runs_but_not_heat
The first step in troubleshooting this problem is to ensure you have the proper voltage at the receptacle. Take a reading across the two hot terminals at the terminal block on the back of the dryer. This is the RED and BLACK wires where the power cord connects. To ensure your safety, please follow these steps:
1. UNPLUG the dryer.
2. Remove the coverplate on the terminal block.
3. Connect your meter leads and plug dryer back in.
4. Take your voltage measurement and UNPLUG dryer.
You should get a reading of 220-240VAC. If the voltage is incorrect, you may have a bad power cord, or a breaker tripped. Check the voltage again at the receptacle. If good, and bad at the terminal - you have a bad power cord. If it is still bad, check the service panel for a possible tripped breaker. Some homes have a dual breaker for the dryer. If one breaker trips, the dryer will only be getting 1/2 the required voltage. The dryer drive motor only uses half the input voltage and will still run, but the heating circuits require the FULL service in order to work. This will give you the symptoms of a dryer that runs, but doesn't heat. If the breakers are set, and bad at the receptacle, you may need a certified electrician check the wall receptacle.
If the source voltage is good, you have a problem in the heating circuits. The number one cause of dryer heat related problems is clogged or poorly installed vent ducting. This causes the dryer to overheat to the point of failure. The common failed part is the Thermal Cut-Out (TCO). The TCO acts as a fuse and if it trips, it must be replaced.
Please read through the link I provided and make sure you check everything, to be sure. If you have any questions, please let me know. I hope you find this helpful.
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