GE GDT665SGNBB Error Code C7

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• Source: Official GE service manual
• Reviewed by: Geo Technical Editorial
• Published: March 1, 2026
• Updated: March 15, 2026
• DIY scope: Basic user checks are possible.

Error C7 on GE : Water temperature sensor inoperative — the NTC temperature sensor circuit has fa. Follow the troubleshooting steps below to diagnose and fix this dishwasher issue. ## What Error Code C7 Means on a GE GDT665SGNBB Water temperature sensor inoperative — the NTC temperature sensor circuit has failed ## What This Error Means Error code C7 on your GE dishwasher indicates the water temperature sensor (NTC thermistor) has failed and is not providing valid temperature readings to the control board. Without temperature data, the control board cannot confirm when the water has reached the target temperature for wash, rinse, and sanitize cycles. The NTC thermistor is typically located in the sump assembly at the bottom of the tub. Its resistance varies with water temperature — at cold water temperature (~68°F / 20°C) it typically reads approximately 10,000–50,000 ohms, decreasing to lower values as water heats up. An OL (open circuit) or near-zero reading indicates sensor failure. A 30-second power reset clears C7 in some cases when it was caused by a transient reading. If C7 returns on the next cycle, the thermistor or its wiring harness requires inspection and likely replacement. ## Quick Diagnostic Summary | Detail | Value | |--------|-------| | Error Code | C7 | | Severity | Medium | | Appliance | GE GDT665SGNBB GE Dishwasher | | User-Fixable | Yes | | Applicable Models | GDT665SGNBB, GDT695SSJSS, PDT715SYNFS | ## Step-by-Step Troubleshooting | Step | Action | What To Do | Expected Result | |------|--------|------------|-----------------| | 1 | Reset the dishwasher power | Turn off the dishwasher circuit breaker for 30 seconds, then restore power. Press the cycle select button and attempt to start a wash cycle. If C7 clears and the cycle completes, the fault was transient. | C7 clears after 30-second power reset. Full wash cycle completes without C7 returning. | | 2 | Access the temperature sensor in the sump | Unplug the dishwasher or turn off the circuit breaker. Remove the bottom rack. Remove the cylindrical filter and flat fine-mesh filter. The NTC temperature sensor is typically a small cylindrical component inserted through the sump housing, with a two-wire harness. On GE models it may also be integrated into the sump assembly. | Temperature sensor is located in the sump assembly. Wiring harness connector is accessible. | | 3 | Disconnect and test thermistor resistance | Disconnect the sensor harness connector. Test across the sensor terminals with a multimeter in resistance mode. At room temperature (~70°F / 21°C), the expected resistance is approximately 10,000–50,000 ohms depending on sensor type. OL = open circuit (burned out). Near-zero = short circuit. Both require replacement. | Sensor reads within the specified resistance range at room temperature. OL or near-zero confirms failure. | | 4 | Inspect sensor wiring harness | Trace the wiring harness from the thermistor to the control board connector (typically accessible behind the door panel after removing the inner door panel screws). Look for chafed, pinched, or broken wires. Reseat the control board connector firmly. | Wiring harness is intact. Control board connector is firmly seated with no broken wires. | | 5 | Replace temperature sensor | Order the replacement NTC temperature sensor for your specific GE dishwasher model. Remove the old sensor (typically pulls straight out or unscrews) and install the new one with the correct orientation. Reconnect the harness, reassemble, restore power, and run a test cycle. | New temperature sensor installed. Wash cycle completes using correct water temperature. C7 does not return. | ## Frequently Asked Questions ### What is the NTC thermistor resistance spec for GE dishwashers? GE dishwasher NTC temperature sensors typically read approximately 10,000–50,000 ohms at cold water temperatures (~68°F / 20°C). The exact specification varies by model — consult your service manual or the GE parts website for model-specific data. At 120°F wash temperature, resistance drops to approximately 2,000–5,000 ohms. An open-circuit (OL) reading at any temperature indicates sensor failure. ### Does C7 prevent the dishwasher from running? C7 may prevent temperature-sensitive cycles (Sanitize, High Temp Wash) from running correctly, as the control board cannot monitor water temperature. Standard wash cycles may still proceed in a timed mode, but without precise temperature control. For food safety, especially with the sanitize function, replace the sensor before relying on the dishwasher for sanitizing. ### Can a faulty temperature sensor cause dishes to come out wet? Yes. GE dishwashers use the temperature sensor to time the heated drying cycle — the control board keeps the heating element energized until the sensor reaches the target drying temperature. If the sensor reads falsely low, the heater may stay on longer than needed (over-drying) or shut off prematurely (wet dishes). C7 can also cause insufficient drying if the sensor does not correctly time the drying phase. ### Where is the temperature sensor on a GE Profile dishwasher? On GE Profile dishwashers (PDT-series), the temperature sensor is located in the sump assembly at the bottom of the tub, accessible after removing the drain filter and fine-mesh filter. Some PDT models integrate the sensor into the sump body — consult the service manual for your specific model to determine whether the sensor is separately replaceable or requires replacing the entire sump assembly. --- Last Updated: March 2026 · GE GE Dishwasher · Error Code C7 ### Is it safe to keep using my GE with error C7? If error C7 does not indicate an immediate safety hazard such as a gas leak, electrical short, or water flooding, you can continue limited use while monitoring the appliance. However, running the dishwasher with an active error code increases the risk of further damage. Address the underlying issue as soon as possible. For high-severity errors, disconnect the appliance and contact a qualified technician. ### How much does it cost to fix error C7 on a GE ? Repair costs for error C7 on the GE dishwasher depend on the root cause. DIY fixes such as cleaning filters, resetting the unit, or reconnecting loose wires cost nothing beyond basic tools. If a component replacement is needed, parts and labor from a certified technician are the main expenses. Contact a GE-authorized service provider for an accurate estimate based on your specific situation. ### What does error code C7 mean on a GE dishwasher? Error code C7 on GE dishwasher models indicates Water temperature sensor inoperative — the NTC temperature sensor circuit has failed. This error is detected by the appliance’s internal diagnostic system and displayed to alert the user that attention is needed. Refer to the troubleshooting steps above for guidance on resolving this issue. ### Is it safe to keep using my GE with error C7? If error C7 does not indicate an immediate safety hazard such as a gas leak, electrical short, or water flooding, you can continue limited use while monitoring the appliance. However, running the dishwasher with an active error code increases the risk of further damage. Address the underlying issue as soon as possible. For high-severity errors, disconnect the appliance and contact a qualified technician. ### How much does it cost to fix error C7 on a GE ? Repair costs for error C7 on the GE dishwasher depend on the root cause. DIY fixes such as cleaning filters, resetting the unit, or reconnecting loose wires cost nothing beyond basic tools. If a component replacement is needed, parts and labor from a certified technician are the main expenses. Contact a GE-authorized service provider for an accurate estimate based on your specific situation. ### What does error code C7 mean on a GE dishwasher? Error code C7 on GE dishwasher models indicates Water temperature sensor inoperative — the NTC temperature sensor circuit has failed. This error is detected by the appliance’s internal diagnostic system and displayed to alert the user that attention is needed. Refer to the troubleshooting steps above for guidance on resolving this issue.