GE dishwasher C8: detergent cup blocked
GE Appliances says C8 means the detergent cup was blocked from opening fully. The owner action is to remove the obstruction and retry.
What this guide covers
Error codes: C8
This guide follows a structured decision tree built from manufacturer troubleshooting information. It does not assume that the most commonly replaced part is the failed part, and it does not show an exact-fit replacement part unless model compatibility has been independently verified.
Continue this exact diagnostic
Safe troubleshooting sequence
Start with the observations and external checks that can be verified without opening energized assemblies. The interactive version asks these in order and changes the path based on your answers.
- Inspect the detergent-cup areaLarge utensils, pans, or other items can block the cup door.
What the answers can lead to
Move the item blocking the detergent cup
The obstruction matches GE’s documented C8 cause.
Evidence strength: Strong
C8 persists with the detergent cup unobstructed
The simple loading cause has been ruled out.
Evidence strength: Strong
When professional diagnosis is the safer next step
The simple loading cause has been ruled out.
Appliance Verdict stops before energized electrical testing, gas-system work, sealed-system work, and other checks that can create unnecessary risk. A technician can use the model, issue, and completed checks from the interactive diagnostic as a starting point.
Repair or replace?
A diagnosis and a repair decision are different questions. Once you have a real repair quote, compare the total repair cost with the all-in price of a comparable replacement. Warranty or protection-plan coverage, appliance age, reliability history, efficiency, and likely future repairs can all matter. Appliance Verdict’s interactive result includes a transparent cost comparison rather than a black-box replacement recommendation.
Manufacturer sources
Dataset reviewed through 2026-09-11. Appliance Verdict is independent and is not endorsed by the manufacturers cited. Always follow the exact owner or service documentation for your model.
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