GE Dishwasher Error Code C7

The C7 error code on a GE dishwasher indicates a fault detected in the turbidity sensor, which also functions as the temperature sensor in this system. At the start of each wash cycle, the control board evaluates the sensor circuit to determine whether the sensor is in an open or shorted condition. If either condition is detected, the control board disables heater operation for the wet portion of the cycle to prevent potential damage or unsafe operation.

The turbidity sensor serves a dual role: it monitors water clarity to determine soil levels and also reads water temperature to guide cycle progression. At room temperature, the sensor should measure approximately 50K ohms of resistance. A reading significantly above or below this value indicates the sensor itself has failed. The control board supplies 5 VDC to the turbidity sensor connector, and the wiring harness between the control and the sensor must have full continuity for the circuit to function correctly.

Common causes of the C7 code include a failed turbidity sensor with out-of-range resistance, a broken or corroded wire in the harness between the sensor and control board, or a fault at the connector itself. Because the heater is disabled when this code is active, dishes will not dry properly and wash temperatures may be insufficient, leading to poor cleaning results. Diagnosing this code requires a multimeter to check sensor resistance, continuity through the wiring, and the 5 VDC supply at the connector.