C4 on a GE dishwasher means it filled twice after a power failure, with a stuck float switch or clogged drain or sump as possible causes.
Model compatibility: GE reuses codes across series and model years, so C4 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
The machine filled twice after a power failure; possible stuck or failed float switch or clogged drain or sump.
C4 appears when the machine filled twice after a power failure. The manual names three possibilities: the float switch is stuck or has failed, or the drain or sump is clogged.
Steps in the manual’s order
Touch Start, then Cancel/Reset.
Tap on the float cover to free the float. It is the plastic cover shaped like an upside down cup in the front left corner of the dishwasher floor.
Look over the sump area at the back, bottom of the tub for debris. It resembles an upside down silverware basket and can clog.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your GE appliance?
Book a specialist visit for a clear estimate and approval before any repair.
