Can you try the following?
1. Make sure that the 3-hr Air-fluff/Wrinkle Prevent option is not on.
2. Run a light load of clothing. Does it heat?
If the unit does not cut off and runs continuously unplug the unit for about 5 minutes and plug back in if it’s turning then we need more details about if the unit is heating or not.
my problem also. DVG45M5500
Dryer keeps running and tumbling but heat turns off.
Only stops when door is openned or it is unplugged
Any ideas on how to make it normal again?