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Appliance Error Codes

GE GDT665SGNBB Error Code C4

Error C4 on GE : Overfill fault — dishwasher has filled with water twice after a power failure, o. Follow the troubleshooting steps below to diagnose and fix this dishwasher issue. ## What Error Code C4 Means on a GE GDT665SGNBB Overfill fault — dishwasher has filled with water twice after a power failure, or the float switch is stuck in the high-water position ## What This Error Means Error code C4 on your GE dishwasher indicates an overfill condition. C4 appears in two scenarios: 1. Post-power-failure double fill: If the dishwasher experienced a power interruption mid-cycle, it may attempt to resume by filling twice in succession. This is a safety protection that prevents overfilling from accumulated fills. 2. Float switch stuck in up position: The float switch is a safety device in the front-left corner of the dishwasher tub — a small dome-shaped plastic float. When water level is normal, the float is down and the switch is open. When water level is too high, the float rises and closes the switch, stopping the fill valve. If the float is stuck in the up position (jammed by debris, food, or a detergent pod wrapper), the switch signals an overfill condition even though the tub water level is normal. C4 typically stops the fill and may also trigger the drain pump to run, attempting to lower the water level. ## Quick Diagnostic Summary | Detail | Value | |--------|-------| | Error Code | C4 | | 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 | Press Start then Cancel/Reset to clear C4 | Press the Start button, then immediately press Cancel/Reset. This clears the C4 fault log and resets the fill cycle counter. The dishwasher will run a drain cycle to remove any standing water. | C4 clears from the display. Dishwasher drains any standing water. Display returns to ready state. | | 2 | Inspect and free the float switch | Open the dishwasher door. Locate the float — a small domed plastic component in the front-left corner of the tub floor (it looks like a small white or gray mushroom cap). Tap the float cover gently downward — it should move freely up and down. If it is stuck in the up position, clear any debris from around and under the float cover. | Float moves freely up and down. Float is in the down (normal water level) position when tub is empty. | | 3 | Clean the float switch area | Remove the float cover by lifting it straight up (it pulls off without tools on most GE models). Clean the area beneath the cover and the float stem with a damp cloth. Reassemble the float cover and verify it moves freely again. | Float cover and stem are clean. Float cap moves freely and returns to the down position under its own weight. | | 4 | Run a short test cycle | Close the dishwasher door and start a Rinse Only or Short Wash cycle. Observe that the dishwasher fills to the correct level (water audible sloshing at the bottom, not splashing out the door) and that C4 does not return during the fill phase. | Dishwasher fills normally without C4. Fill stops at the correct water level. Cycle completes without overfill alarm. | | 5 | Test float switch continuity if C4 persists | If C4 returns repeatedly with no visible debris on the float, the float switch itself may have failed in the closed position. Unplug the dishwasher. Disconnect the float switch wiring. Test with a multimeter — with float down (normal), switch should show open circuit (OL). If switch shows continuity when float is down, the switch has failed and must be replaced. | Float switch shows open circuit (OL) when float is in the down position. Continuity when float is down confirms switch failure requiring replacement. | ## Frequently Asked Questions ### Where is the float switch on a GE dishwasher? The float switch is located in the front-left corner of the dishwasher tub floor. Look for a small dome or mushroom-shaped plastic cap that sits in a round housing in the tub floor. Lift the bottom rack to see it clearly. The float cap can be lifted straight up to access the area beneath it. ### C4 appeared right after a power outage — is the dishwasher damaged? No. GE dishwashers use a fill counter to prevent overfilling after power interruptions — when the dishwasher resumes mid-cycle after a power outage, it may add water twice in succession. Pressing Start then Cancel/Reset clears this counter. This is not a hardware failure. ### Can a detergent pod wrapper cause C4? Yes. Detergent pod wrappers, dish rack tines that break off, and food debris can float under the dishwasher tub and settle under the float switch, jamming it in the up position. This is particularly common with pod-style detergent when the plastic film wrapper does not fully dissolve. Use detergent pods rated for your dishwasher temperature to ensure complete dissolution. ### What happens if the float switch fails permanently? A permanently closed float switch will prevent the dishwasher from filling (it thinks the tub is always at overfill level). C4 will appear on every fill attempt. Replace the float switch assembly — it is an inexpensive part and replacement requires only removing the bottom rack and unscrewing the switch from beneath the tub floor. --- Last Updated: March 2026 · GE GE Dishwasher · Error Code C4 ### Is it safe to keep using my GE with error C4? If error C4 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 C4 on a GE ? Repair costs for error C4 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 C4 mean on a GE dishwasher? Error code C4 on GE dishwasher models indicates Overfill fault — dishwasher has filled with water twice after a power failure, or the float switch i. 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 C4? If error C4 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 C4 on a GE ? Repair costs for error C4 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 C4 mean on a GE dishwasher? Error code C4 on GE dishwasher models indicates Overfill fault — dishwasher has filled with water twice after a power failure, or the float switch i. 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.