Match the symptom, then work through the safe checks.
1. What best matches what you observe?
2. Complete only the checks that are safe for you.
Show stop conditions
- Water is rising or overflowing
- Filling continues with power disconnected
- Water reached electrical parts
Likely causes
- Inlet valve is not closing
- Water-level sensor is abnormal
- Drain path is restricted
- Excess suds affect level sensing
Quick checks, in order
Stop the cycle and close water
Prevent additional filling.
Check whether filling stops when off
If it continues, keep the supply closed.
Check for suds and slow draining
Both can appear as an overfill.
Do not bypass protection
Float and level circuits require proper diagnosis.
What happens when C4 appears?
The inlet valve may be mechanically stuck.
A float, pressure sensor, hose, or control may be wrong.
Allow foam to settle and correct detergent use.
Stop and get qualified help when
- Water is rising or overflowing
- Filling continues with power disconnected
- Water reached electrical parts
Official support and model manuals
Use the full model number from the rating label. The manufacturer manual is the deciding reference when codes differ by region or product family.
Frequently asked questions
What does C4 mean on a GE Appliances dishwasher?
On many model families, C4 indicates that the dishwasher detected an overfill. Confirm the exact model and region because the same display can be used differently.
Can I clear C4 by unplugging the dishwasher?
A short power reset may clear a temporary state, but it will not fix a blocked hose, leak, failed sensor, motor, heater, or wiring fault. Stop if the code returns.
Should I replace a part based only on the code?
No. A code identifies a system or condition, not always the failed component. Complete safe external checks and use the model-specific manual or qualified service.