I have a KitchenAid dishwasher KDTM354DSS4 that fills and drains normally, and even the vent works. However, it just won’t wash. The spray arms don’t move at all. On top of that, I’m getting 6-1 and 6-4 error codes. If you’re facing the same issue, here’s a clear breakdown of what’s going on and how to fix it.
Quick Answer
The 6-1 and 6-4 error codes usually point to a water supply issue or float switch problem, which can prevent the wash pump from activating. Even if the dishwasher fills, incorrect water levels can stop the spray arms from working.
Step-by-Step Fix Guide for KitchenAid Dishwasher Not Spraying
Step 1: Understand what the error codes mean
- 6-1 error code → Water not entering properly
- 6-4 error code → Float switch issue (detecting wrong water level)
These two errors together often indicate a water level or sensor problem.
Step 2: Check the water supply line
Make sure your dishwasher is getting enough water.
- Confirm the water valve is fully open
- Inspect the supply hose for kinks or blockages
- Ensure proper water pressure
Even if it fills slightly, low pressure can stop proper washing.
Step 3: Inspect the water inlet valve
The water inlet valve controls how much water enters.
- If faulty, it may allow partial filling only
- This leads to insufficient water for spray arms
Replace it if it’s clogged or not opening fully.
Step 4: Check the float switch
The float switch detects water levels.
- If stuck or faulty, it may think the dishwasher is full
- This stops additional water intake and disables washing
What to do:
- Locate the float inside the tub (usually a small dome)
- Lift it gently to see if it moves freely
- Clean any debris underneath
Step 5: Inspect the wash pump motor
Since your dishwasher fills and drains but doesn’t spray, the wash pump might not be running.
- Listen for humming or silence during wash cycle
- If silent, the pump may be faulty or not receiving power
Step 6: Check spray arms for blockages
Even though they’re not moving, confirm they aren’t clogged.
- Remove spray arms
- Clean out food debris from holes
Step 7: Consider control board issues
If everything else checks out:
- The control board may not be sending power to the wash pump
- This is less common but possible with combined error codes
Extra Tips and Best Practices
- Always run your dishwasher with proper water pressure
- Clean filters and spray arms regularly
- Use the correct detergent to avoid buildup
- Reset the dishwasher after fixing issues
Common Mistakes to Avoid
- Assuming the pump is bad before checking water levels
- Ignoring the float switch (very common cause)
- Replacing parts without diagnosing error codes
- Overlooking simple hose or valve issues
FAQs
Why does my dishwasher fill but not spray water?
This usually means the wash pump isn’t running or there’s not enough water inside.
What does KitchenAid error 6-4 mean?
It indicates a float switch problem, often caused by debris or overfill detection.
Can low water pressure cause spray arms not to work?
Yes. Without enough water, the spray arms won’t spin properly.
Conclusion
If your KitchenAid dishwasher KDTM354DSS4 fills and drains but doesn’t spray, focus on the water inlet valve, float switch, and wash pump. The 6-1 and 6-4 error codes strongly point to water level issues. Start with simple checks like the float and supply line before moving to bigger components. Fixing the root cause will restore proper washing quickly.
Reference Links
https://www.searspartsdirect.com/diy/article/kitchenaid-dishwasher-error-codes
https://www.appliancepartspros.com/repair-help/kitchenaid-dishwasher-repair-help
https://owner.electrolux.com/support-articles/article/1819543-dishwasher-not-drying
