Is is normal for the heating element to cycle on and off. The element is usually protected by an operating (or hi-limit) thermostat that helps regulate the internal operating temperature. The element is not supposed to stay on continuously or you could end up with a scorched clothing, or a fire hazard. As your clothes get dryer, the heating element should cycle less. As long as you are not having any problems with dryer performance, you shouldn't have anything to worry about.
However, if your dryer is heating, but you are experiencing longer dry times or poor drying efficiency, the following link can give you some things to check before you assume there is a malfunction with your dryer:
http://www.fixya.com/support/r3578821-dryer_takes_too_long_to_dryThe number one cause of dryer heat related problems is poor exhaust ventilation. If not vented properly, a dryer will not dry efficiently, will actually take longer than required to dry, and will cause the heating circuits to overheat to the point of failure. The dryer will actually seem hotter than usual in many cases as the heating circuits begin to overheat. This is also the source of many fire hazards if not resolved. Read through the link provided and review some of the potential causes.
If you have any questions, please post back with your MODEL NUMBER and let me know. I hope you find this information is helpful.
NOTE: If you thoroughly check everything and still have problems let me know. The problem could be related to a thermostat failure.
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