---
title: "Dishwasher wash performance service"
description: "LG dishwasher wash performance service — the visit for a machine that runs perfectly and cleans badly."
url: "https://lgmiami.support/services/dishwasher-wash-performance-service/"
date_modified: "2026-09-06"
Appliance type: "Dishwashers"
---


# LG dishwasher wash performance service

### Half of this visit is showing you the machine

It is the least mechanical job on this site and often the most useful. The spray arms come off and get cleared hole by hole, the filter is washed, the rinse aid reservoir is filled, the water temperature is measured, and the arms are spun by hand with a full load in place to find the tall item that has been stopping one of them for a year. Then we walk you through it: which rack takes what, why a platter leaning across the middle blocks the upper feed, and why this machine cleans better on a long cycle than a short hot one. People are usually more annoyed than pleased, and it stays fixed.

What this involves

Arms, filter, diverter and temperature, measured rather than guessed

One rack clean and one dirty points at the diverter — nE on this make

Hard water and no rinse aid explain the chalky film, and no repair fixes that

Watch it run

Arms spinning, water arriving, temperature climbing. A machine is easiest to diagnose while working.

Clear the arms and the filter

Every jet, not just the obvious ones.

Measure the water temperature at the machine

The single most common cause of poor cleaning that is not the filter.

Test the diverter

nE. If one rack cleans and the other does not, this is where it lives.

Show you the loading

Not a lecture — the two or three habits that account for most of it, demonstrated on your own racks.

### Nothing is broken. Is this really worth paying for?

Ask us on the phone first and we will tell you what to try for nothing. If you have already done the filter, the rinse aid and the spray arms and it still comes out gritty, then yes — something is genuinely restricted and finding it takes the tools.

### Why is there grit on the top rack only?

That is the upper feed. On this make the water is directed to different arms at different points in the cycle, so a blocked upper arm or the part that switches the flow is the usual answer, and both are found with the machine running.

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