Hobart LXn/LXGn - LXn/LXGn Will Not Drain

⚠️ Caution / Monitor Closely
Warning: The information provided here is for educational purposes only. Working with commercial kitchen equipment involves high voltage, gas, and high temperatures. We strongly recommend contacting a certified service technician for any repairs. We are not responsible for any damage or injuries resulting from DIY repair attempts. This information is provided 'as is' without any guarantees of completeness or accuracy.

TLDR

On your HOBART LXn/LXGn SERIES DISHWASHERS unit, a "Machine Will Not Drain" issue typically indicates a restricted drain line or improper plumbing setup. Begin by inspecting the external drain hose for any kinks, blockages, or an incorrect slope preventing water flow. Ensure the building's drain plumbing allows for the necessary flow rate to handle the dishwasher's discharge.

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Technical Details

Repair Steps:

  1. Safety First: Disconnect Power. Before performing any inspection or maintenance, always turn off the dishwasher and disconnect it from the main power supply to prevent electric shock or accidental operation.
  2. Inspect External Drain Hose. Locate the dishwasher’s drain hose, typically exiting the rear of the machine. Check for any visible kinks, bends, or crushing that could restrict water flow. Ensure the hose has a continuous downward slope towards the floor drain or air gap to facilitate gravity drainage.
  3. Check Internal Drain Path and Filters. Open the dishwasher door and remove the wash arms and filters from the sump area. Thoroughly clean all filters (coarse, fine, and pump inlet screens) of any food debris, grease, or foreign objects. Inspect the sump area for blockages and ensure the drain pump impeller area is clear.
  4. Verify Drain Pump Operation (If Applicable). If the machine uses an active drain pump, check its functionality. With power disconnected, try to rotate the impeller by hand to ensure it’s not jammed. If you suspect an electrical fault with the pump, a qualified technician should test for proper voltage and current draw.
  5. Assess Building Plumbing and Drain Line. Ensure the building’s floor drain or standpipe is not clogged or restricted. If the dishwasher drains into an air gap, verify the air gap itself is not blocked. For continuous drain applications, confirm the plumbing allows for adequate flow rate to prevent back pressure. Consider using a plumber’s snake if the building drain is suspected to be the primary blockage.
  6. Check Drain Valve (If Equipped). Some LXn/LXGn models may utilize a drain valve. Ensure this valve is opening and closing correctly. A faulty drain valve can prevent water from exiting the wash tank. Listen for its operation during the drain cycle or visually inspect if accessible.
  7. Test and Monitor. Once all potential restrictions are cleared, reconnect power and run a test cycle. Observe the drain process carefully to ensure water evacuates completely and at a normal rate. If the issue persists, a service call may be necessary to diagnose internal components such as pressure sensors or control board issues.

Common Questions:

Q: Why is my HOBART LXn/LXGn dishwasher not draining even after clearing visible clogs?

A: If basic clearing doesn’t resolve the issue, the problem might be more complex. This could include a faulty drain pump, a defective drain valve, an obstruction deeper in the plumbing beyond the machine’s direct line, or a control board issue not signaling the drain cycle correctly. Professional diagnostics are recommended.

Q: How often should I clean the filters on my HOBART LXn/LXGn to prevent drain issues?

A: For optimal performance and to prevent drain restrictions, it’s recommended to clean the dishwasher’s filters daily or at least after every major service period, especially in high-volume operations. Regularly inspecting the sump for debris is also crucial.

Q: Can an improper installation lead to drain problems with a HOBART LXn/LXGn dishwasher?

A: Yes, improper installation is a common cause of drainage issues. This includes incorrect drain hose routing (e.g., lack of proper slope, too long, too many bends), an inadequately sized or clogged building drain connection, or issues with the air gap setup. Always ensure installation adheres to Hobart’s specifications and local plumbing codes.

When to call a technician

Consider calling a certified technician if:

  • The error keeps coming back after you've tried the steps above.
  • You're not comfortable doing the checks or repairs yourself.
  • You notice unusual noise, smell, or behaviour.
  • Equipment is under warranty and you want official service.
  • You need the unit back in service quickly with minimal downtime.

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