mypros+
Error code reference

GE Dishwasher Error Code C6

Water temperature too low after the maximum 20-minute extension of the detergent wash period (or final rinse…

GE codesGE dishwasher codes

Water temperature too low after the maximum 20-minute extension of the detergent wash period (or final rinse with Sani option on GSD2800); specified temperature was not reached.

First step from the service manual

Check incoming hot water temperature; check heater operation and heater circuit.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

MyPros+ Max

Get the full diagnostic procedure for C6.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What C6 means on a GE dishwasher

The C6 error code on a GE dishwasher indicates that the water temperature failed to reach the required threshold within the detergent wash period, even after the control allowed a maximum 20-minute extension of that cycle phase. On GSD2800 models equipped with the Sani option, C6 can also trigger during the final rinse if the sanitizing temperature is not achieved within the allotted time. The dishwasher's control board monitors water temperature continuously via a thermistor or thermostat, and when the target temperature is not met within the extended window, the control flags this fault and halts normal progression of the cycle.

The two primary systems involved in this code are the water heating circuit and the incoming hot water supply. The heating element is responsible for boosting water temperature during the wash and rinse phases, and a failure anywhere in that circuit, including the element itself, the wiring harness, connectors, or the control relay that switches power to the heater, will prevent adequate heating. If the element is open or has significantly degraded resistance, it will not produce sufficient heat output regardless of cycle extension time.

Incoming water temperature is equally important to diagnose first. If the hot water supply to the dishwasher is below roughly 120 degrees Fahrenheit at the inlet, the heater must work harder and longer to compensate. Running a nearby hot water tap before starting the dishwasher helps rule out supply-side temperature deficits. A faulty thermistor or temperature sensing circuit can also cause a false C6 by reporting incorrect temperature data to the control board, even when the water is actually reaching adequate temperature.

Source: manufacturer service documentation.

Common causes of C6

  1. 01

    Insufficient incoming hot water temperature

    Wiring / connection

    If the home's water heater is set too low or the dishwasher is far from the water heater, incoming water may arrive too cool for the machine's heater to compensate within the allotted time. Run the hot water tap at the nearest sink until it is hot before starting the dishwasher to help rule this out.

  2. 02

    Failed or open heating element

    Part replacement

    The heating element can burn out or develop an open circuit, leaving it unable to raise water temperature. An open element will typically show no continuity when tested with a multimeter and must be replaced.

  3. 03

    Defective heater circuit wiring or relay

    Wiring / connection

    Loose connections, burnt terminals, or a failed control board relay that supplies power to the heating element can interrupt the heating circuit without the element itself being faulty. Inspect wiring harness connectors at the element and control board for corrosion or heat damage.

  4. 04

    Faulty thermistor or temperature sensor

    Part replacement

    If the temperature sensor is out of calibration or has failed, it may report a lower temperature than actually exists, causing the control board to log C6 even when the element is functioning. Compare sensor resistance readings against the specified temperature-resistance curve for the unit.

  5. 05

    Control board failure

    Part replacement

    If the control board is not properly switching power to the heating element or is misreading sensor signals, it can produce a C6 fault even when all other components are intact. This is the least common cause and should be considered only after the heater circuit and sensor have been ruled out.

See the test procedure for each cause

Frequently asked questions about C6

What does C6 mean on a GE dishwasher?
The C6 code means the dishwasher water temperature did not reach the required level during the wash period, even after a 20-minute extension the control board automatically adds to allow more heating time. On GSD2800 models with the Sani option, it can also appear if the final rinse does not reach sanitizing temperature. The fault points to a problem with the incoming hot water supply, the heating element, or the heater circuit.
Can I fix a C6 error on my GE dishwasher myself?
Some causes of C6 are DIY-friendly, such as checking that your home's water heater is set to at least 120 degrees Fahrenheit and running hot water at the sink before starting a cycle. Testing the heating element for continuity with a multimeter is also within reach for a handy homeowner. However, replacing the heating element, repairing wiring, or diagnosing a control board issue may require disassembly of the dishwasher tub and comfort with electrical components.
Is it safe to keep using my dishwasher when it shows a C6 code?
Running the dishwasher with a C6 fault means the water is not reaching proper wash or sanitizing temperatures, so dishes may not be adequately cleaned or sanitized. This is not an immediate safety hazard in the sense of a leak or electrical short, but it does mean the machine is not performing as intended. It is best to resolve the underlying cause before relying on the dishwasher for sanitizing tasks.
How much does it cost to repair a C6 error on a GE dishwasher?
Repair costs depend on what is causing the fault. If the fix is simply adjusting the home water heater temperature, there is no parts cost. A replacement heating element typically ranges from roughly 20 to 80 dollars for the part, with additional labor costs if a technician is hired. A new control board is the most expensive potential repair, often ranging from 100 to 300 dollars or more for parts alone.
Will resetting my GE dishwasher clear the C6 error code?
Resetting the dishwasher may temporarily clear the C6 code from the display, but if the underlying problem with heating or water temperature has not been fixed, the code will return during the next cycle when the machine again fails to reach the required temperature. A reset is useful for confirming whether the fault is intermittent, but it is not a repair. Address the root cause to prevent the code from recurring.

Related GE dishwasher codes

All GE dishwasher codes
View all 222 GE dishwasher codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass