Samsung # DV42H500EW/a3 no longer dries

[selkov]

So this week the dryer stopped getting hot.

Could someone give me a path to diagnose where the problem could be?

[Vance R]

Check for 240 vac at terminal block on dryer. Check venting system for restrictions. If those are good then you'll need to disassemble dryer to check the thermostats and heating element. 

[Josh Smith]

If all that checks out, don't forget the centrifical switch on the motor.  Not a very common failure, but if you miss it once I'll never miss it again.