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Kenmore Dryer Not Heating Thermal Fuse

My kenmore he4 gas dryer is not heating up, i checked the thermal fuse, high limit thermostat and replaced the thermistor a year agoeport this by manage my lifeuly 19th, 2010y dryer is a kenmore elite he4 model110866400, the flame comes on for about a minute then shuts offhen i go into diagnostic test mode and push start button.