How To Fix A Commercial Dishwasher That Is Not Drying Dishes Properly

A commercial dishwasher is an important piece of equipment for restaurants and commercial kitchens. When working properly, it will clean the dishes and dry them. However, if your dishwasher is cleaning dishes but not drying them properly, you may need the assistance of a commercial appliances repair expert. To know what are the causes of this problem and the common ways to fix it, keep reading.

Check The Vent Assembly

Many commercial dishwashers use vent assembly for drying dishes after the cleaning cycle is over. This vent assembly has a motorized door that opens and allows hot steam from the rinse cycle out of the machine.

However, if the vent assembly is faulty, the vent will not open completely. In turn, the dishes won’t dry properly and you will feel the moisture on the dishes if you take a dish out of the machine after the cycle.

So, inspect the vent assembly. Sometimes, it is blocked and only requires cleaning to function properly. Other times, the vent could be damaged and might require replacement.

Look For Vent Fan Motor Issues

As explained above that most commercial dishwashers use evaporation to dry the dishes in the machine. In this method, vents are opened in the dishwasher and the fan motor blows the warm air out of the vents after the completion of the rinse cycle.

If you have checked the vent assembly and it is working fine, then the issue can be with the vent fan motor. Inspect the fan motor and notice any damage to the fan blades. Other than the fan blades, the motor itself could be malfunctioning.

You can check if the motor is functioning well or not by testing the motor using a multimeter. You will detach the motor from the machine so if it’s confusing, let an appliances expert do it.

  • Turn off the dishwasher and remove the connection to the motor so it doesn’t receive any electricity.
  • Take a multimeter for the continuity test. Set the multimeter to the lowest resistance range and then connect its terminals to the two ends of the motor. If the multimeter shows a reading, the motor is working fine, but if the multimeter doesn’t show any reading, it denotes that the motor is faulty.

Check The Heating Element

Many dishwashers also use a heating element for drying dishes. This small electrical component is susceptible to damage and if it sustains any damage, you will need to replace it.

You can check the condition of the heating element using a multimeter and perform a continuity test.

See If The Thermostat Is Malfunctioning

Commercial dishwashers feature thermostats as well for keeping the temperature to the set numbers without exceeding and overheating. As thermostats are for the safety of the dishwasher, if a thermostat is not working, the dishwasher may turn off. This will also cease the drying process.

You can again take your multimeter to check if the thermostat is faulty.

  • Unplug the power to the dishwasher.
  • Remove the thermostat from the dishwasher. The location may vary, but mostly, it’s at the bottom of the dishwasher.
  • Take your multimeter and set it to the lowest resistance range. Connect the terminals of the multimeter with the two ends of the thermostat. Make sure you’re doing this at room temperature and not near any heating device.
  • If you see a reading on the multimeter, the thermostat is fine.
  • For the next test, move the thermostats close to a heating device like a heater. Check the reading on the multimeter. If it shows the reading 0, the thermostat is not faulty, but if it shows a reading other than 0, you should replace it.

Inspect The Rinse Aid Dispenser

If the rinse aid dispenser is empty, the dishwasher won’t be able to dry dishes. So, check the rinse aid dispenser and fill it up. Moreover, don’t remove anything from the dishwasher before the rinse and dry cycles are over.


If your restaurant dishwasher is not drying dishes or the dishes are not completely dry, you should inspect the appliance yourself or hire commercial dishwasher repair services to check the machine and perform repairs. Repairing the machine yourself can damage the machine further, so it’s better to let an expert fix the appliance. topac

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