The short answer
C7 says the circuit that tells the control how hot the water is has stopped reporting. The machine will often still wash, but it is washing blind: without a temperature reading the control cannot hold the heat step or confirm a sanitising rinse. This is a sensor-and-wiring fault rather than a plumbing one, so nothing you clean or unblock will change it.
GE dishwasher code as the manufacturer publishes it
Reference| Code | Meaning |
|---|---|
| C7 | The dishwasher's water temperature sensor circuit has become inoperative. |
What you observe alongside the code
- Cycles that run far longer than they used to — The control waits for a heat target it can never confirm.
- The sanitised indicator never lights — Without a temperature reading the claim cannot be made.
- Dishes dry poorly and glassware comes out cool — The heat step is being skipped rather than failing.
- The code comes and goes between cycles — Typical of a connector rather than a dead sensor.
What triggers it, most likely first
- A loose or corroded sensor connector — First: the connector sits in a damp part of the cabinet and backs off with vibration. It is also the only cause on this list that is free to fix.
- A failed thermistor — Second: the sensor is a resistor that drifts and eventually goes open. It is a cheap part in an awkward place.
- A chafed or wet harness between sump and control — Third: the loom is routed past the pump, and a rub-through shows up as an intermittent code.
- A control board input that has failed — Last, and rare: a board that reads every other sensor correctly is unlikely to have lost just this one.
Check in this order, and why
- Note whether the code is constant or intermittent — Constant points at the sensor, intermittent at a connector.
- Cut power and reseat the sensor connector — Free, and it resolves a good share of intermittent cases.
- Look for water tracks or green corrosion at the terminals — Visible evidence beats guessing at the part.
- Measure the thermistor only after the wiring is proved — A meter reading means nothing through a bad connector.
Clearing the code, then the owner-safe checks
- Switch off at the breaker and pull the toe panel — This is where the sensor harness and its connector are reachable.
Tools: screwdriverAbout 15 min
- Unplug and reseat the temperature sensor connector — Look for a spread terminal or a pushed-back pin while it is apart.
Tools: flashlightAbout 15 min
- Dry the connector body and reassemble — Water bridging two pins reads as a short to the control.
Tools: clothAbout 10 min
- STOP HERE if the code survives a reseat — Replacing the thermistor means going into the sump, and that is a service call.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. On a built-in dishwasher the supply is not switched at the door, so the breaker is the only reliable off. Leave the door latch switch wired as it is: it stops the pump and the heater the moment the door opens. The sensor sits in the sump where wash water collects, so bail the tub before you go under the machine.
When this code is a service call
Call once the connector has been reseated and the code still sets, because the next step is replacing a sensor inside the sump with the machine drawn out and laid over. Call sooner if the cycle no longer ends by itself: a control waiting forever for a heat target will keep the heater energised, and that is not a state to leave running unattended.
Neighbouring GE dishwasher codes
Which model lines this reading applies to
This reading of C7 applies to current GE and GE Profile built-in dishwashers with a digital display or a lit status row, the platform on which the manufacturer publishes it. A timer-driven machine with no display never shows it, and a Monogram or Hotpoint-badged unit can use the same characters for a different fault. Sensor resistance values and connector positions are family-specific and are not published here for that reason. Where a model-specific page exists for your unit it is linked above and is the more specific answer: part-level detail differs by family and belongs there.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
