How to Clean the Filter & Spray Arms on a KitchenAid KDPM604KPS Dishwasher — Step-by-Step Instructions
Step-by-step instructions for the KitchenAid KDPM604KPS (built-in dishwasher, freeflex third rack, 44 db). Parts and access points can differ slightly by production year — the steps below cover the common layout for this platform, and the model notes flag its quirks.
None. This is the single highest-value 20 minutes you can spend on any kitchen appliance.
Tools
- Old toothbrush
- Toothpick or wooden skewer
- Sink with hot water
Parts
- None — monthly maintenance
Step by step
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1 Pull the bottom rack and find the filter
The cylindrical mesh filter sits in the tub floor, usually with a quarter-turn arrow marking. Twist counterclockwise and lift out — many have a flat coarse filter beneath that lifts out too.
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2 Rinse and scrub
Hot water and a toothbrush on the mesh until water runs through freely. The grime you’re removing is what’s been re-spraying onto your glasses.
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3 Check the sump while it’s open
Feel the exposed sump area for glass shards, fruit stickers, and pit fragments — remove anything that isn’t machine.
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4 Pop off the spray arms
The lower arm usually lifts or unscrews; the upper arm unclips from the rack. Poke every jet clear with a toothpick and rinse the arms through.
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5 Reassemble and run a cleaner cycle
Filter locked back in (it must click — a loose filter lets debris reach the pump), arms clicked on, then run the hottest cycle empty with dishwasher cleaner or citric acid. Repeat monthly — non-negotiable in Arizona hard water.
KitchenAid KDPM604KPS notes & error codes
On premium dishwashers the wash pump is the expensive part and the filter is the free one, and a clogged filter mimics a dying pump almost exactly. Always clean and re-test before quoting a pump on a machine at this price.
| Code | What it means |
|---|---|
| F8 E4 | Overfill or flood condition |
| F9 E1 | Drain fault |
| F7 E1 | Heating fault |
| F6 E4 | Inlet fault |
Full details for this machine — common problems, causes, and costs — are in the KitchenAid KDPM604KPS repair guide. The general version of these instructions is here.
If cleaning doesn’t restore wash quality, water temperature or the circulation pump is next in line — a quick professional diagnosis beats replacing parts on a hunch. If you'd rather skip it entirely, find a dishwasher repair pro near you →
What this repair costs professionally
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