Look at the tub floor before you do anything
Kenmore is a badge applied to dishwashers from several manufacturers, and the designs differ in a way that matters here: some have a removable filter that must be cleaned by hand, and some grind food waste instead. Look at the tub floor first, because advice for the wrong design wastes your time. After that the ranking is the same everywhere: the filter if you have one, the spray arms, the water temperature, rinse aid, and loading.
What you are seeing
- Food residue left on dishes after a full cycle.
- Only one rack comes out dirty.
- A gritty film on glasses and plates.
- Everything is clean but heavily spotted.
- Not this fault: Dishes left wet at the end is a drying question, not a cleaning one.
- Not this fault: Standing water in the tub is a drainage fault and a different page.
Most likely causes, in order
- Tub filter clogged - on machines that have one — Why ranked: First because a blocked filter recirculates dirty water over everything, and because knowing whether you have one comes before every other check.
- Spray arm blocked or unable to turn — Why ranked: Second because it explains one rack being dirty while another is clean, which nothing else on the list does.
- Water not hot enough at the start of the cycle — Why ranked: Ranked here because detergent needs heat, and running the sink tap first costs nothing.
- Rinse aid empty — Why ranked: It explains spotting on dishes that are otherwise perfectly clean, which is a different complaint from dirty dishes.
- Overloading or poor loading — Why ranked: Last as a cause but common as a contributor - nested items shield each other however healthy the machine is.
What to check, in order
- Look at the tub floor for a filter that twists out by hand. — Because: It decides whether rank one applies at all, and the two designs need different answers.
- If there is a filter, twist it out and look at what is in it. — Because: Rank one affects the whole load and is corrected in minutes.
- Spin each spray arm by hand and check the holes are clear. — Because: Rank two explains one rack being dirty and the other clean.
- Run the sink tap hot before starting a cycle. — Because: Rank three costs nothing and changes how well the detergent works.
Checks you can do safely
- Open the door and look at the tub floor: note whether there is a filter that twists out by hand. — N: 1 — Tools: Torch — Time: quick
- If there is one, twist the filter out, rinse it under a tap and refit it firmly. — N: 2 — Tools: Gloves — Time: moderate
- Spin each spray arm through a full turn by hand and clear any blocked holes with a cocktail stick. — N: 3 — Tools: Cocktail stick — Time: moderate
- Run the kitchen tap until it is properly hot, fill the rinse aid reservoir, and run a normal load. — N: 4 — Tools: Rinse aid — Time: one cycle
- Stop rule: Stop here. Removing a spray arm assembly, the wash pump or the heating circuit is service work.
Before you reach into the tub
Safety
Switch off the dishwasher breaker before reaching into the sump. A capacitor can hold a charge after the power is off. The water in a tub can still be hot at the end of a cycle. Broken glass in the sump is common; use gloves and a torch. Never reach towards a grinder area with the machine powered.
When this becomes a service call
Dishes stay dirty with the filter clean and both arms turning freely. One rack never washes with its arm confirmed clear. The machine never seems to heat the water during a cycle. A part is needed - have the model number ready before calling.
Nearest pages
What this page does not cover
This is generalized information for Kenmore dishwashers as a group. It does not map model prefixes to builders or name parts. Where a family- or model-specific page exists it supersedes this one.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
