How to Fix a Commercial Dishwasher Water Inlet Valve Not Opening

Author: Stella Ava

In a fast-paced commercial kitchen, a fully operational dishwasher is crucial for maintaining efficiency and hygiene. However, if your commercial dishwasher’s water inlet valve is not opening, it can lead to a series of problems, including incomplete wash cycles and unclean dishes. This article provides a comprehensive guide on identifying the issue, troubleshooting, and fixing the water inlet valve in your commercial dishwasher.

H2: Understanding the Role of the Water Inlet Valve in Commercial Dishwashers

In any commercial dishwasher, the water inlet valve is an essential part. It regulates the water flow into the washer at the beginning of every washing cycle. When you initiate a cycle, the dishwasher’s control system sends an electrical signal to the water inlet valve, instructing it to open and allow water to fill the wash chamber. If the valve fails to open, your dishwasher will not fill with water, resulting in incomplete cleaning and operational delays.

Common Causes of a Dishwasher Water Inlet Valve Not Opening

Several factors can cause the dishwasher water inlet valve in a commercial kitchen to fail to open. Understanding these causes is essential to diagnosing and fixing the issue effectively. Some of the most common reasons include:

1. Clogged or Dirty Valve

Over time, mineral deposits, debris, or food particles can accumulate inside the water inlet valve, obstructing water flow. In high-demand environments like restaurants, where water is often hard or untreated, this can happen more frequently.

2. Faulty Solenoid

The water inlet valve is controlled by an electromagnetic solenoid, which is responsible for opening and closing the valve. If the solenoid is damaged or worn out, it will not respond to the electrical signals from the control board, preventing the valve from opening.

3. Electrical Issues

A malfunction in the wiring or control board can prevent the signal from reaching the solenoid, leaving the water inlet valve stuck in the closed position. Issues like frayed wires, corroded connections, or broken control boards can all lead to this problem.

4. Low Water Pressure

Commercial dishwashers require a specific water pressure for them to function as they should. The inlet valve may not open fully due to low water pressure which means few quantity of water can be allowed in the machine. This can be due to a water issue or a plumbing issue.

5. Defective Valve

Sometimes, the valve itself is faulty due to manufacturing defects, excessive wear and tear, or long-term use. In such cases, the entire valve will need to be replaced to restore normal function.

Steps to Fix a Dishwasher Water Inlet Valve Not Opening

Here are some practical solutions to resolve the issue of a commercial dishwasher water inlet valve not opening:

1. Clean the Water Inlet Valve

A simple yet effective solution is to clean the water inlet valve, especially if it’s clogged with debris or mineral deposits. Here’s how:

  • Turn off the Dishwasher: First of all, safety comes first – turn off the dishwasher by unplugging it if it is possible.

  • Turn off the Water Supply: Turn off the supply of water as this might lead to a flow of water and much more damage.

  • Remove the Inlet Valve: On most models, they are usually placed at the bottom or at the back part of the dishwasher. Disconnect it carefully.

  • Clean the Valve and Filter Screen: Rinse the valve and the filter screen connected to it which is connected to with a small brush and water only. Make sure that all dirt and mineral deposits are cleaned.

  • Reinstall the Valve: If cleaned, then tighten the valve, connect the water inlet, and power on the dishwasher again.

If debris build-up was the problem, then this cleaning process should solve the problem of the valve.

2. Test and Replace the Solenoid

If cleaning the valve doesn’t resolve the issue, the next step is to check the solenoid for functionality. To test the solenoid:

  • Multimeter Testing: Using a multimeter, test the solenoid for electrical continuity. The solenoid has to be changed if it isn't registering continuity.

  • Replace the Solenoid: If the solenoid is defective, purchase a new one that is compatible with your commercial dishwasher model and install it according to the manufacturer’s instructions.

Replacing the solenoid is relatively inexpensive and can restore normal function to the water inlet valve.

3. Check the Electrical Connections

Problems with the electrical supply are often the root of the problem with water inlet valves. To troubleshoot electrical problems:

  • Inspect Wiring: Check the wiring doing the solenoid at the control board. Check the wiring for any traces of wear, or strands of the insulation being broken or corroded and if any of these is the case with any wire, replace them.

  • Check the Control Board: If the wiring seems to be at par then the issue could be with the control board of the unit. Make sure that the board is signaling the appropriate signals for appropriate correction to the water inlet valve during the wash cycle. If the board is defective or damaged then it could be fixed or replaced by an expert technician.

Electrical connections are very important in the functioning of the water inlet valve.

4. Monitor and Adjust Water Pressure

Ensure that the water pressure in your restaurant’s plumbing system is adequate for the commercial dishwasher’s requirements. Low water pressure can prevent the inlet valve from opening fully.

  • Verify that there are no obstructions or problems with the water supply line by checking the water supply.

  • Adjust Water Pressure: If necessary, adjust the water pressure regulator to increase the pressure, making sure it aligns with the dishwasher’s specifications.

Maintaining the correct water pressure will help the valve operate efficiently.

5. Replace the Water Inlet Valve

If all other measures have not worked, then it may be time to replace the whole water inlet valve. Here’s how:

  • Turn off Power and Water: First of all ensure that the electricity supply and water supply are off before fixing the dishwasher.

  • Remove the Old Valve: Remove the water inlet valve of the dishwasher if it is already installed.

  • Install the New Valve: Fit the new valve in the appropriate manner, orthodox to the designers’ recommendations with regard to joints and other connectors.

  • Reconnect Water and Power: Be sure to turn the water and power back on and an operation check of the dishwasher could be made to ensure the quaity performance of the valve in question.

When all other attempts fail, replacing a malfunctioning valve is the most long-term fix.

A malfunctioning water inlet valve can cause significant disruptions to the operation of a commercial dishwasher. Most of the time, you can solve the problem on your own by following the steps provided in this article. However, if the issue is not solved, then one should consult an expert in that given matter. If this is applied you will be assured of a long-lasting and efficient running of your commercial dishwasher.