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Investigating the Functionality of a Commercial Dishwasher Pump Motor

For those who own a commercial kitchen, a dishwasher is one of the most important pieces of equipment. Cleaning hundreds of plates, glasses, and utensils every day manually takes a significant amount of time and effort. So investing in a commercial dishwasher can save you and your staff hours of work every day. However, with constant use, some parts of the dishwasher can fail to work, leading to reduced efficiency. One of the most critical parts of a dishwasher is the pump motor. In this article, we explore the working principles of a Hobart dishwasher pump motor, common problems that might affect its functionality, and some troubleshooting tips.

Understanding the Functionality of a Hobart Dishwasher Pump Motor

A dishwasher pump motor is responsible for the movement of water throughout the machine during washing, rinsing, and draining cycles. In a Hobart dishwasher, this is achieved through the use of a centrifugal pump. The centrifugal pump is powered by an electric motor. When the dishwasher is turned on, the motor rotates the impeller, which, in turn, creates a low-pressure area at the center of the pump. This low-pressure area makes water rush into the pump, and the centrifugal force created by the impeller’s rotation ejects the water out of the pump and through the dishwasher’s spray arms. The motor’s speed can be controlled through the dishwasher’s control board or by an external frequency drive.

Common Problems Affecting a Hobart Dishwasher Pump Motor

Although a dishwasher pump motor is designed to provide years of service, it can develop problems that might cause it to fail. Some of the most common problems include:

1. Clogging – Water flowing through the dishwasher contains a lot of debris, and particles that can accumulate in the pump’s impeller, reducing its effectiveness. To solve this problem, the impeller needs to be removed and cleaned regularly.

2. Overheating – Overheating can result in burnt-out wiring and damaged bearings making the dishwasher pump motor less efficient. To avoid overheating, the dishwasher’s control board should be checked regularly or an external frequency drive should be installed.

3. Mechanical Damage – The dishwasher pump motor can become damaged if it runs without enough water to lubricate its moving parts. This can cause the bearings to become damaged, leading to reduced efficiency or complete failure. If you hear any grinding noise, it’s usually a sign that the bearings have worn out and need replacement.

Troubleshooting a Hobart Dishwasher Pump Motor

If you suspect that your dishwasher pump motor is faulty, the following troubleshooting tips can help you identify the problem and fix it:

1. Check the Power Supply – The first step in troubleshooting a dishwasher pump motor is to check the power supply. Ensure that the dishwasher is properly plugged in and that the circuit breakers are not tripped.

2. Check the Control Board – The control board regulates the dishwasher’s pump motor speed. If it’s faulty, it can cause the pump motor to fail. Use a multimeter to test the control board and replace it if necessary.

3. Check for Clogs – As mentioned earlier, clogs can reduce the efficiency of the impeller. To check for clogs, remove the impeller and clean it. If necessary, remove the pump housing and clean it thoroughly.


A dishwasher pump motor is an essential component of a Hobart dishwasher. Its functionality ensures that the dishwasher runs smoothly and efficiently, reducing the workload for your staff. Knowing how to troubleshoot and fix common problems affecting a dishwasher pump motor will save you time and money. However, if you are not confident in your ability to fix the problem, it’s always best to call a professional technician to handle the repair. It’s imperative to maintain your commercial dishwasher, not just for efficiency, but also for hygiene.

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