I don't know where to get the model from on the unit.
It won't heat up. I took it apart and checked the sensoes with a ohm meter, everything checked good. Some sensors have 3 wires on the fan manifold.I cheated the door switch and started the unit, the thing glowed, so I quickly turned it off. Yes I turned he gas off.

The model number is DG512 series 2
I can't figure out how to edit the model number of this post

Well it looks like the power comes from the control panel, into the output air manifold sensors, then to the cone heat sensor, to the flame sensor, then the first solenoid. Must be main solenoid. Then when the main solenoid gets power, it allows the 2nd solenoid to actuate.

Must be the 2nd solenoid. Not sure if you can run the dryer without the drum to check for flame, sounds dangerous without vacuum pressure from the fan.

So I checked the flame sensor again, and the cone sensor. I assume the vacueem sensors works since that where the power starts from. The solenoids are strange, there must be a rod or pin inside the shaft that is spring loaded on the top.

Any comments are welcomed.