If this is an ELECTRIC dryer, the following link explains how to troubleshoot a no heat problem:
http://www.fixya.com/support/r630242-dryer_runs_but_not_heat
Begin by verifying your input voltage at the wall receptacle. You should read 220-240 VAC across the two hot leads (the left and right slots in the receptacle). If good, remove the back cover over the terminal block of the dryer (where the power cord is installed) and plug the dryer back in. Take a reading across the RED and BLACK wires at the terminal block. If good, your problem is in the heating circuitry. If bad, you have a bad power cord.
The reason I mention the input voltage is because many people assume it is good if the dryer drum is still spinning. The drive motor which turns the drum, however, only uses half the input voltage because it runs off 110-120 VAC. The heating circuits require the full 220 service in order to operate. If you are missing a portion of the source voltage, the dryer will exhibit the same problems you describe.
Read through the link I provided and pay particular attention to the section that discusses proper dryer ventilation. Most dryer heat
related problems are actually caused by poor ventilation causing the dryer to overheat to the point of failure. If you haven't cleaned your ventilation ducting anytime recently, now might be a good time. Leaving a dryer in a clogged or poorly ventilated condition will cause
repeated failures of any components you might be replacing.
If you have questions along the way, let me know. I hope you find this information helpful.
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