answer provide by http://www.fixya.com/users/jeryflores

Are you having problems with your GE Profile Harmony but don't know where to start to troubleshoot? Let the dryer do it for you, here's how:

It's called "Field Service Mode"
1. Press the POWER key to turn the dryer on.
2. Press HELP. The main help screen is displayed.
3. Press and hold MY CYCLES and BACK simultaneously for 3 seconds. Press EXIT to return to the home screen.

The system will give you a description of possible hardware failure and troublecode.

Replace the failed piece of hardware and plug your system back in. It will go through a boot-up sequence and verify that your machine is working once again.