If you’re dealing with an LG dishwasher not cleaning situation, you’re not alone. We get calls about this every single week from homeowners in Phoenix, Scottsdale, Paradise Valley, Chandler, and Gilbert. Dishes coming out cloudy, greasy, or still crusted with last night’s dinner isn’t just annoying — it’s a sign something specific has gone wrong inside that machine, and ignoring it usually makes it worse. Let’s walk through exactly what’s happening and what you can do about it.
The Most Common Causes of an LG dishwasher not cleaning
Before you run out and buy a new appliance — don’t. Most cases of dishes still dirty after a cycle come down to a handful of fixable problems. Here’s what we see most often:
- Clogged spray arms. A spray arm packed with hard-water mineral deposits or food debris can’t spin or shoot water properly. In the Phoenix metro, hard water is a real issue — Maricopa County tap water is notoriously mineral-heavy, and those minerals build up fast.
- Dirty or blocked filter. Most modern LG dishwashers have a manual filter at the bottom of the tub. If it’s packed with gunk, water can’t circulate the way it needs to.
- Failed wash motor or pump. If the motor isn’t pushing water with enough pressure, even clean spray arms won’t do the job. You might notice the water sounds quieter than usual during a cycle.
- Faulty water inlet valve. Not enough water getting in means not enough water to wash. Simple math.
- Detergent dispenser not opening. If the door on the dispenser is stuck or broken, your detergent sits in the tub instead of releasing mid-cycle.
- Wrong detergent or too little of it. Cheap detergent or pods that have absorbed moisture won’t dissolve correctly.
How to Check for a Clogged Spray Arm
Pull the bottom rack out and take a good look at the lower spray arm. Give it a spin — it should rotate freely with almost no resistance. Now look at the small holes along the arm. If any of them are white-crusted or visibly blocked, that’s your culprit. You can usually pop the arm off (most LG models twist counterclockwise), soak it in white vinegar for 20–30 minutes, and clear the holes with a toothpick. Same process for the upper spray arm.
If you’ve done that and the dishes are still dirty after the next cycle, the problem is deeper — motor, valve, or control board territory. That’s when you call us.
Nine times out of ten, a dishwasher that won’t clean just needs the right diagnosis — not a replacement. We’ve seen too many perfectly good machines get tossed because someone guessed wrong.
— David, TOTO Appliance Repair
LG-Specific Issues Worth Knowing
LG makes solid dishwashers — we repair them regularly across North Scottsdale and Chandler — but they do have a few recurring quirks. The TrueStream pump motor can wear down and lose pressure over time. The EasyRack Plus system is convenient until a tine clip breaks and a bowl flips over mid-cycle, blocking water flow. And the control panel on some older LG models can develop software glitches that interrupt cycles before the wash stage completes.
None of these are death sentences for the appliance. All of them are repairable — usually same day if we have the part on the truck, which we usually do.
| Symptom | Likely Cause | DIY Fix? |
|---|---|---|
| Dishes still dirty after cycle | Clogged spray arm or filter | Often yes — clean the arm and filter |
| Bottom rack dirty, top okay | Lower spray arm blocked | Yes — soak and clear spray arm holes |
| Top rack dirty, bottom okay | Upper spray arm or water pressure issue | Partial — clean arm, then call if no improvement |
| Residue on dishes, nothing clean | Detergent dispenser failure | Inspect door latch — replace if broken |
| Nothing clean at all | Wash motor or water inlet valve | No — needs a technician |
When to Stop Troubleshooting and Call a Pro
If you’ve cleaned the filter, cleared the spray arms, and tried a fresh bag of quality detergent — and your dishes are still coming out dirty — stop guessing. At that point you’re likely dealing with a mechanical or electrical component failure that requires the right diagnostic tools and genuine replacement parts. Our professional dishwasher repair service covers all major brands including LG, and we serve Phoenix, Scottsdale, Paradise Valley, Chandler, Gilbert, and the surrounding Maricopa County area.
And if your machine has developed a smell alongside the cleaning problem, that’s usually a separate but related issue with the drain or interior. We wrote a full breakdown on that — check out why your dishwasher smells and how to fix it.
A repair almost always costs less than replacement, and a well-maintained LG dishwasher can run reliably for 10–15 years. According to ENERGY STAR’s dishwasher efficiency guidance, a certified model uses less than 4 gallons per cycle — so keeping yours running efficiently also saves water and money every month.
We’re a family-owned business here in Maricopa County — not a national franchise with a rotating crew of strangers. When you call TOTO Appliance Repair, you get a straight diagnosis and a fair price. No upsell pressure, no telling you to replace something that just needs a $60 part. Beyond the dishwasher, our washing machine repair service and our full range of home appliance repair services cover everything under your roof.
— David, TOTO Appliance Repair | Serving Phoenix, Scottsdale, Paradise Valley, Chandler, Gilbert & all of Maricopa County
