I’ve got the same issue.
Replaced the element, things were then okay for a few hours, dried some clothes as usual.
Then it went wrong again. Only cold air, and the red flashing light. Ran diagnostic, code 63.
So must be a problem with a sensor somewhere or the mainboard? Also worries me that it has burnt out the new heating element in the process.
Does anyone know where the sensor would be? I can find where to order them from, but no diagrams of where to find it on the drier.