Commercial Dishwasher Troubleshooting Guide

Commercial dishwashers are reliable and resilient. However, since they are used on a daily basis, they can often encounter problems that need to be fixed. You should be contacting commercial appliances repair services for dishwasher repairs. But if you want to quickly inspect and fix the appliance, let’s take a look at some of the most common problems amongst commercial dishwashers and how to troubleshoot them.

Common Causes Of Leaking Dishwashers

If a commercial dishwasher is experiencing leaking problems, it might be due to boilers and rinse tanks. This problem is mostly caused due to rust. Depending on the water hardness, a commercial dishwasher might develop rust a year after its purchase. Limescale buildup damages the inlet components and might even leave sediments in your rinse cycle.

Additionally, minerals found in water can deposit on rinse tanks and boilers while it evaporates. As a result, calcium and magnesium deposits can severely damage the components since they are highly corrosive.

To prevent such issues from taking place, you should maintain and clean the appliance every day. This way, the corrosive deposits are removed as soon as they deposit. Areas that have hard water should use water softeners to change the chemical composition of water.


O’Rings are seals designed to prevent fluid or air from entering connecting joints. These are mostly made of rubber and are found in vehicles as well. Since they are made of rubber, they have a life attached to them as well. Fortunately, replacing O’Rings is neither expensive nor time-consuming.

O’Rings are found in several areas inside the commercial dishwasher. They are easy to replace but only a professional should be hired for the job.

Water Inlet Valve

The water inlet valve is designed to open and shut off the water flow to the dishwasher. If it happens to malfunction, water might begin to pool or is not supplied at all. If the water pools, the appliance is going to overflow on the next cycle.

To solve the issue, you should check the water inlet valve for any damage or cracks. At the same time, you should also ensure its fitting. If the valve fails to perform upon inspection, consider replacing it.

Faulty Float Assembly Or Switch

The Float Assembly or Switch is designed to shut off the water supply once an appropriate level has reached. The float rises with the water supply and triggers the switch to shut down the water supply. If incase due to the same reason, the switch is not turned off, the water will continue to be supplied, overflowing the machine.

To troubleshoot the problem, you should check whether something is interfering with the float assembly. If the float assembly is working perfectly, it might be a faulty switch, which will require a replacement.

Why Is Your Commercial Dishwasher Not Draining?

If your commercial dishwasher is not draining the water, the first culprit might be the drain pump. The drain pump is the only component responsible for draining the water once the cycle ends. If the drain pump is clogged or blocked, it might not be able to drain the water. Collapsed bearings or simply pump failure might be the reason as well.

Unfortunately, identifying a faulty drain pump is not easy. You are going to need a professional who inspects the pump thoroughly before concluding it as a culprit.


The impeller is a mechanical device usually made from nylon, metal, or hard plastic. This device is designed to create a sucking force through its rotation and contact with water or air. Since the device is made from plastic or metal etc. it will need a replacement over time.

Furthermore, some commercial dishwashers use twin impellers. One is used to spray water during the wash cycle whereas the other to drain the water. If the impeller happens to be faulty, it will affect the drain functioning of the machine. Even though impellers are tough devices, age can be the reason behind needing replacement.

Final Word

Concluding, regularly cleaning and maintaining your commercial dishwasher ensures the longevity of your washer components. If there are some problems with the appliance, you should only contact a professional commercial dishwasher repairs Springfield expert for repair or replacement.