ge top control dishwasher just beeps three times and won't do anything when i press start.

Diagnosis

On the GE GDT665SSNSS, three rapid beeps upon pressing the Start button is the system's specific way of communicating a "Door Open" state. The control board is not receiving the required electrical signal from the door latch switch to confirm the unit is sealed. If the circuit isn't closed, the dishwasher will refuse to engage the pump or fill valve to prevent flooding your kitchen floor. This failure typically occurs for one of three reasons: a physical obstruction in the tub preventing the door from seating, a worn-out door strike (the hook) that no longer reaches the switch, or a failed micro-switch within the latch assembly. You can confirm this by observing the "Start" button; if it flashes or the beeps occur instantly without the motor attempting to prime, the board is convinced the door is ajar. In many cases, the plastic hook on the door has developed a hairline crack or has worn down by a few millimeters, which is enough to prevent the switch from triggering.

How to Fix It

To resolve this, you must ensure the mechanical connection between the door and the chassis is absolute. Follow these steps:

1. Open the door fully and inspect the bottom rack. Ensure no oversized plates or protruding utensils are pushing against the door's interior panel.
2. Locate the door strike (the plastic hook) at the top center of the door. Inspect it for any white stress marks or cracks in the plastic. If it is loose, tighten the mounting screw.
3. Clear the latch receptacle at the top of the tub frame. Use a flashlight to ensure no food debris or mineral buildup is preventing the hook from sliding fully into the slot.
4. Close the door firmly. Instead of a gentle push, apply a steady, firm press directly above the latch area. Listen for a distinct, audible "click."
5. Press the Start button and immediately close the door within 3 seconds. The GDT665SSNSS has a tight timing window for the door-close signal to register before it timeouts and beeps.

If That Didn't Work

If the door is physically closed but the beeps persist, you are dealing with a component failure. Try these alternatives:

• Replace the Door Latch Assembly: The micro-switch inside the latch assembly (Part #WR02X24544 or equivalent) can fail electrically. You will need to remove the inner door panel to access the switch. Use a multimeter to test for continuity; if the switch doesn't show a closed circuit when pressed, the assembly must be replaced.
• Adjust the Door Hinges: Over time, the door can sag. If the hook is hitting the frame slightly off-center, it won't engage the switch. Loosen the hinge bolts slightly, realign the door so it sits perfectly square, and tighten them back down.
• Perform a Hard Reset: Occasionally, the control board hangs in a "fault" state. Turn off the circuit breaker for the dishwasher for exactly 5 minutes. Restore power, open the door, close it firmly, and attempt to start a cycle again.
• Check the Door Seal: Inspect the large rubber gasket around the tub. If the seal has bunched up or folded inward, it can create enough tension to push the door back out by a fraction of an inch, breaking the electrical connection of the latch.

Heads Up

• Avoid slamming the door to "force" the latch; this can crack the plastic housing of the switch and lead to a permanent failure.
• If you replace the latch, ensure the wiring harness is seated deeply into the connector; a loose pin will trigger the same three-beep error.
• Periodically clean the latch area with a damp cloth to prevent grime from interfering with the spring-loaded mechanism.
• Always verify that the dishwasher is level. A tilted machine can cause the door to hang improperly, leading to intermittent latching issues.