The Most Common Causes
These are the failure modes our technicians see most often on this symptom — listed in rough order of frequency. We don't publish step-by-step repair instructions for liability reasons, but the diagnostic process below identifies which one applies to your machine before any parts get swapped.
Clogged spray arm jets
Hard water scale and food debris block the small holes. Water sprays unevenly. Cleaning the arms restores coverage.
Failed heating element
Without heat the wash water doesn't reach the temperature needed to cut grease. Dishes come out with film and residue.
Cold incoming water
Dishwashers expect 120°F water. If your water heater is set too low or the supply line is too cold, wash cycles never reach effective temp.
Worn wash pump impeller
Pump still runs but doesn't push enough pressure. Spray arms turn slowly and coverage suffers.
Failed water inlet valve or restricted supply
Not enough water reaches the tub for a proper wash.
Before You Call — What's Safe to Try
Some of this you can absolutely handle, and we'll tell you straight which parts. Other fixes are doable but carry real risk, and a few you should never touch. This is general guidance, not professional advice — always unplug the appliance (or shut off the gas/water) before you check anything, and if it feels beyond you, that's exactly what the $50 Quick Check is for.
✅ Safe to try yourself
- Clean the filter and spray arms. A gunked filter and clogged spray-arm holes are the top causes. Rinse the filter; poke the spray-arm jets clear with a toothpick.
- Run hot water first. Run the kitchen tap hot before starting so the wash begins with hot water.
- Use rinse aid and fresh detergent. Old caked detergent and no rinse aid leave film. Refill both.
- Do not block the arms. Tall items can stop a spray arm from spinning. Reload so the arms turn freely.
⚠️ Doable — but know the risk
- Spray arm or wash pump. A cracked spray arm or weak wash pump is replaceable with some disassembly.
🛑 Call a pro — don't touch this
- Control board
- Heating-element wiring
The Honest Answer
Yes — every cause. Spray arm cleaning is sometimes free at the diagnostic. Heating element $200–$300. Wash pump $300–$400. No scenario where a cleaning issue makes a dishwasher not worth fixing alone. Parts availability and labor complexity matter more than the age of the machine. A well-built ten-year-old appliance with an available part is often worth fixing twice. A newer unit with a discontinued board is the harder call. Our techs lay both options out side-by-side — repair cost vs. replacement cost — and let you decide. Try the replacement calculator for a quick framing, but every situation is different.
Where's My Model Number?
A real technician needs your model number to nail the diagnosis and bring the right part. Here's where it hides — snap a photo when you find it.
Need the Part? We'll Find It.
Tell us your model and what's wrong — we identify the exact part, confirm it fits, and ship it to your door or install it. No hunting for part numbers; that's our job.
The 4-Option Technician Decision Report
After your $50 Quick Check (or $100 in-home diagnostic), a real technician — not a chatbot — reviews your model, video, and symptoms. They build a Technician Decision Report with four honest options:
You pick which option works for you. No surprises, no hidden costs. We don't share specific part numbers — we source the parts ourselves and ship them directly to your door, so you never have to hunt for the right SKU.
What Will This Cost?
Pick the likely repair to see our flat labor price next to what most shops charge all-in. The exact part price comes after a quick diagnosis — you'll see the real number.
Real Numbers, No Mystery
Most repairs for this symptom land in the range below. The diagnostic confirms exactly which job it is before any quote — and the diagnostic fee credits toward your repair labor.
People Also Ask
Other Things That Could Be Wrong
Middle TN + Louisiana
Whether you're in Nashville or Hammond, the diagnostic process is the same. We service Middle Tennessee and Louisiana with six experienced technicians.
Outside the cities listed? Chat with Ant — we'll confirm coverage before you pay anything.
Chat with Ant — Get a Real Answer Today
Chat with Ant — tell us what's wrong, share a quick video and your model number photo, and a real technician will build your Technician Decision Report. No hold music, no guessing, no commitment until you see your options.