GE Dishwasher Error Code C8: Thermistor Circuit Repair
Updated: February 2026
The GE dishwasher error code C8 signals a problem with the thermistor circuit. The control board has detected that temperature readings are outside acceptable parameters or the circuit has an electrical fault.
Understanding the C8 Error
The thermistor continuously monitors water temperature throughout wash cycles. The control board uses this data to regulate heating element operation and ensure proper cleaning temperatures. C8 appears when readings are too high, too low, or the circuit is open or shorted.
Complete Troubleshooting Guide
- Step 1: Turn off power at the circuit breaker. Remove the lower dish rack for interior access.
- Step 2: Remove the spray arm and filter assembly to expose the sump area where the thermistor is mounted.
- Step 3: Locate the thermistor—a small sensor probe near the heating element with two wire connections.
- Step 4: Disconnect the thermistor wires and test resistance with a multimeter. At 68°F (room temperature), expect 50,000-60,000 ohms.
- Step 5: Test the thermistor by warming it gently (hand heat or warm water). Resistance should decrease smoothly as temperature rises.
- Step 6: If readings are infinite, zero, or don't change with temperature, the thermistor has failed and needs replacement.
- Step 7: Check wiring from thermistor to control board for damage, particularly in the door hinge area where wires flex repeatedly.
Install a new thermistor by pressing it into the mounting grommet in the sump area. Ensure the sensor tip makes good thermal contact. Route wiring carefully to avoid pinching. After installation, run a heated wash cycle to verify proper temperature regulation and confirm C8 is cleared.
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