Samsung DV218AGW/XAA shows code that looks like an upside down capital FO. Added comment to "Samsung gas dryer DV218AGW runs a couple of minutes then shuts off.

SOURCE: samsung dryer dv317aeg/xaa has code on display

http://www.washingmachinereviews.org.uk/fault-codes/errors-and-solutions/ use this site try this solution is what the company suggests simply folo down the list till u see your error code with there solution if this does not work u willhave t call a tech to do test on your heater as well as the wiring going to the heater

SOURCE: My Samsung Dryer (DV218AEB/XAA) Error code HE

invalid heating temp when running. call for service.

SOURCE: Our dryer (Samsung Model DV218AGW/XAA)

I had the same issue with a Samsung DV209AEW/XAA.

What I found was the belt had come off and the spring on the drum belt pully had come off.

After I disassembled the whole top and front to figure out I could not access what I needed from there I discovered I needed to enter in from the vent is.

Anyway here is some info:

Rear Access:

1) On the back where the Vent comes out you have 4 total screws. 3 of them are on the outside edge and the fourth is more of a middle mount that holds the tube to this bracket. Remove all four screws now you can lift and lean this plate to remove it.

2) This will also free up the vent tube and it can be pulled and cleaned also if you desire.

3) With these items out of the way you can now access the pulley for the belt and other items.