You need to check the "Thermal fuse","thermal cut-off" and "high-limit thermostat". Check all three with a multimeter for continuity. Replace as needed.
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I would check your thermal fuse. It is the white plastic looking fuse with 2 wires going to it should be somewhere near your blower housing. There is also a hi limit thermostat and thermal cut off that could cause a no heat issue. Just remove the thermostats and bring them into an appliance parts store and have them check them for continuity. If the thermal fuse is bad then also replace your cycling thermostat 3387134 and check your venting because this will blow from a vent restriction or over heating. Hope this helps.
_MJ_
This video shows how to replace the thermister. The element is directly to the right of that. 160 views
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