I originally put this in someone else's thread but it's officially become a "fix it or buy a new one" situation and the dryer isn't that old.

I replaced the heating element, both "thermostats" on the element housing, and the "thermostat" next to the thermal fuse. I also replaced the heating element, which was fine according to resistance checks.

The heating element does not cut off. I suspect that is what knocked out the 1st thermal fuse (and 2nd, 3rd, and 4th) which is what started me on this adventure.

I have the lower cover off and when I run the dryer in Air Only the heating element glows and (of course) the dryer gets very hot if I let it run. Eventually it would trip the thermal fuse if I let it.

I put the dryer in diagnostic mode and no matter what I do, I get the same three error codes.

1- Primary Control failure :mad:
30- Restricted Air Flow Condition
70- No Communication Between Electronic Assemblies.

Air flow test and all of the tests Heat Won't Shut Off section (4a, 4b, 4c) pass.

Since it looks like the Primary Control is toast I'm going to ignore 30 for now. 1 and 70 seem to indicate that I need to order a primary control assembly. It's a couple of hundred bucks so I want to be sure nothing else can cause this (not very optimistic there is btw)

Thoughts

That's the conclusion that I came to. The control board is on the way. I'll find out sometime later this week.

I checked that with the old heating element, found nothing, and replaced it anyway. I checked the new one too.