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The 1 error on your Kitchenaid Dishwasher means the control board has detected a stuck or closed relay on the main control. This typically indicates a fault with the electronic control board itself and usually requires professional repair or replacement.
| Error code | 1 |
|---|---|
| Meaning | Stuck relay detected on main control board |
| Severity | High — Dishwasher will not operate until fixed |
| Time to fix | 10–15 minutes for reset; 60–90 minutes for control board replacement |
| Tools needed | Screwdriver (Phillips and flathead), multimeter (for advanced testing) |
What the 1 error means
The error code 1 (sometimes displayed as 9-1) indicates that the main control board has detected a stuck relay. A relay is an electrical switch that controls power flow to various dishwasher components. When a relay becomes stuck in the closed position, it can cause continuous power delivery to components even when they should be off, creating a safety concern. The control board recognizes this fault condition and displays error code 1 to prevent potential damage or hazards.
Common causes
- Failed or defective main control board with stuck relay contacts
- Moisture damage to the control board from leaks or high humidity
- Power surge or electrical spike that damaged control board components
- Age-related wear on relay contacts causing them to fuse together
- Manufacturing defect in the control board assembly
- Corrosion on relay contacts from environmental exposure
How to fix the 1 error
- Reset the dishwasher: Turn off power at the circuit breaker for 5 minutes, then restore power. This can sometimes clear temporary electronic glitches. Press Cancel/Drain and try running a cycle to see if the error returns.
- Check for moisture: Remove the lower access panel and inspect the control board area for signs of water damage, leaks, or excessive moisture. If present, identify and fix the leak source, then allow the area to dry completely for 24 hours before testing.
- Inspect wire connections: Ensure all wire harnesses connected to the control board are firmly seated and free from corrosion or burn marks. Disconnect power first, then carefully disconnect and reconnect each harness to ensure proper contact.
- Test with diagnostic mode: Enter service diagnostic mode (consult your model's service manual) to run relay tests. This can help confirm whether the control board is truly faulty or if another component is causing the error.
- Replace the main control board: If the error persists after reset attempts, the control board likely needs replacement. Order the correct part using your model number, disconnect power, remove the control board mounting screws, disconnect all wire harnesses (photograph connections first), install the new board, and reconnect all wiring.
- Consider professional service: If you're uncomfortable working with electrical components or the error continues after control board replacement, contact a qualified appliance technician to diagnose and repair the issue safely.
FAQ
Can I continue using my dishwasher with error code 1?
No, you should not use the dishwasher when this error appears. A stuck relay can cause components to receive power when they shouldn't, creating potential safety hazards including overheating or electrical damage. The dishwasher will likely not operate normally until the fault is resolved.
How much does it cost to fix a Kitchenaid dishwasher error code 1?
If you replace the control board yourself, expect to pay £150–£250 ($180–$300) for the part. Professional repair typically costs £250–£400 ($300–$500) including parts and labor. Some repairs may be covered under warranty if your dishwasher is still within the warranty period.
What's the difference between error code 1 and 9-1 on my Kitchenaid dishwasher?
These are the same error code displayed differently depending on your dishwasher model. Newer models may show just "1" while older models display "9-1". Both indicate a stuck relay on the main control board and require the same troubleshooting and repair steps.
