GE GDT665SSNSS Dishwasher Problems & Error Codes — Overview
The GE GDT665SSNSS is a stainless steel tub dishwasher that uses GE’s fault-code system (C1 through C8) to flag specific problems. These codes are not universal across all GE models, so the exact meaning should be matched to what the display shows. The most frequent service calls on this model are drain-related faults (C1, C2, C3) caused by clogged drain lines, air gap blockages, or a failed drain pump, followed by water temperature issues (C6, C7) and float or fill problems (C4, C5).
Most Common Problems on This Model
- C1 code: pump-out exceeded 2 minutes Restricted drain line, blocked air gap, disposer knockout plug not removed, or clogged sump filter. Clear the air gap, verify the disposer connection and knockout, inspect the drain hose for kinks or clogs, clean the sump and filter, then test drain pump operation.
- C2 code: total pump-out exceeds 7 minutes Heavy drain restriction, weak or failed drain pump, or blocked hose, air gap, or disposer path. Reset the unit, check the entire drain path and pump impeller, and replace the drain pump if it cannot evacuate water properly.
- C3 code: dishwasher will not drain Drain pump failure, blocked sump, blocked hose, or failed control signal to drain mode. Power reset first, then inspect the pump, harness, drain path, and control output if unresolved.
- C4 code: machine filled twice after power failure or stuck float Float stuck, debris in sump, or control logic issue after power interruption. Tap or unstick the float cover, inspect the sump for debris, verify float switch action, and confirm water level control.
- C6 code: water temperature too low Water heater set too low, cold supply in lines, heater circuit issue, or thermistor problem. Verify hot water supply, heater operation, and temperature-sensing circuit, then test heater-related components if temperature stays low.
- C7 code: water temperature sensor circuit inoperative Failed thermistor or temperature sensor, loose or burned connector, wiring issue, or control board input problem. Disconnect power, inspect sensor wiring and connectors, test the sensor circuit, and replace the sensor if out of spec or open.
- C8 code: detergent cup blocked Silverware, pan handles, or other loading obstruction at the dispenser door. Remove the obstruction, relatch the door, wait about 30 seconds, and confirm dispenser release.
- C5 code: pump-out time too short Usually a fill issue caused by water supply off, low inlet flow, or float-related problem. Verify the water supply, rerun the cycle, and check the float area and inlet function.
Parts That Commonly Fail
| Part | Notes |
|---|---|
| Drain pump | Amazon | Fails on C2 and C3 codes when the pump cannot evacuate water within the time window or does not run at all. |
| Water temperature sensor (thermistor) | Amazon | Triggers C7 code when open, shorted, or out of specification. Also contributes to C6 temperature faults. |
| Float switch | Amazon | Sticks or fails on C4 code, causing overfill or repeated fill cycles after power interruption. |
| Detergent dispenser assembly | Amazon | Mechanically blocked or latch-spring failure causes C8 code when the cup will not open fully. |
Dishwasher Error Codes for This Model
These codes apply to this model line:
- Ge Dishwasher C1 error code
- Ge Dishwasher C2 error code
- Ge Dishwasher C3 error code
- Ge Dishwasher C4 error code
- Ge Dishwasher C5 error code
- Ge Dishwasher C6 error code
- Ge Dishwasher C7 error code
- Ge Dishwasher C8 error code
- Ge Dishwasher Ef error code
- Ge Dishwasher F56 error code
- Ge Dishwasher F9 error code
- Ge Dishwasher Ff error code
When to Call a Pro
Call a service tech if you see a C7 code and are not comfortable testing thermistor resistance or tracing wiring to the control board. Drain pump replacement (C2, C3) requires access to the base pan and electrical connections. If the unit continues to show any code after you have cleared the drain path, cleaned the filter, and power-cycled the machine, the problem is likely the pump motor, control board output, or wiring harness. Also call a pro if the unit repeatedly overfills (C4) after you have checked the float, since that can indicate a control board or valve fault that needs proper diagnosis to avoid water damage.