GE DISHWASHER GDT665 WON T START General Troubleshooting

Main Electronic Control Board

The main control board on GE GDT series dishwashers is the primary failure point for units that display power but refuse to initiate a cycle. Source 2 notes that 'PF' (Power Failure) and '999' (Leak/Control Error) require board-level resets; if the board's internal DC power supply or logic relays fail, the unit will not respond to the 'Start' command even if the UI is illuminated.

SKU: WD21X24901

Door Latch Assembly

The dishwasher logic requires a verified closed-circuit signal from the door latch microswitch before opening the water inlet valve. Over time, the latch housing can warp or the microswitch contacts can fail, leading the unit to 'think' the door is open, which prevents the cycle from starting without necessarily throwing a visible error code.

SKU: WD21X10490

Pressure Sensor / Flood Switch

Referencing Sources 2 and 3, this model features 'Active Flood Protect.' If the pressure sensor detects a blockage or a false-positive flood condition (C4 code or 'LEAK DETECTED'), the firmware enters a safety lockout mode. This prevents the motor from engaging and stops the unit from starting to mitigate potential water damage to the home.

SKU: WD21X25468