GE · Dishwasher
GE Dishwasher C4 Error Code
Float switch stuck or double fill after outage
What this error means
C4 appears when machine filled twice after power failure or float switch stuck—GE official definition.
How C4 is detected
GE dishwasher models lock the door or lid before energizing fill, heat, or high-speed spin. C4 means the latch switch never sent a "locked" signal to the main control, or the lock motor did not complete its travel. On GE GDT655SSJSS, GE GDF630PSMSS, and similar variants, clothing caught in the gasket, a misaligned strike, or a failed latch assembly are the most common mechanical causes—not the board itself.
Inspect the door gasket perimeter and strike alignment before replacing the latch. Float stuck up is reported frequently on this code. After correcting mechanical issues, shut off water supply. If the latch clicks but C4 persists, the door lock switch or wiring harness to the control board likely needs testing with a multimeter.
Do not force the door open during an active cycle; wait for the lock to release when the board de-energizes the lock motor—usually two to three minutes after canceling power on most GE units.
Common causes
- Float stuck up
- Inlet valve leaking after outage
- Clogged drain leaving water
- Suds lifting float
Step-by-step fixes
- 1Shut off water supply
- 2Dry tub and verify float moves down
- 3Inspect inlet valve for drip
- 4Clear drain path
When to call a technician
Water enters tub when off—replace inlet valve before reuse.
Affected models
- GE GDT655SSJSS
- GE GDF630PSMSS
- GE GDT225SSLSS
Prevention & maintenance
- Wipe the door gasket weekly and avoid overloading items against the seal—C4 often starts as a slow leak or latch misalignment.
- Record when C4 appears in the cycle and whether it clears after a 60-second power reset on your GE dishwasher—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for C4; GE uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting C4; reversed plugs on pumps and valves cause immediate repeat faults.