May be a bad Start Switch (part of the Controller)

Membrane Keypad Test:

To activate, unplug power cord and reconnect.

Press and hold TEMPS and STOP keypads simultaneously at least 2-3 seconds within 10 seconds of power up.

Test Sequence:

Press each keypad (CYCLES, TEMPS, SPEED, OPTIONS etc.) separately to verify each keypad functions and all the LEDs for the selection light up

Press START to verify Display readouts are functional

If the touchpad fails this test, you can buy a new touchpad here with a one year warranty.

Source: Frigidaire FWTBB30DS0 front load won't start