Hobart LXn/LXGn - Error 007: Wash Tank Temperature Error

🛑 Critical / Stop Operation
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, error code 007 indicates the wash tank temperature is 32°F (0°C) or lower, preventing proper sanitization. This is typically caused by issues with the heating elements, the wash tank thermostat, or an inadequate water level. A persistent error requires immediate inspection of these components by a qualified technician to restore functionality and safety.

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Technical Details

Repair Steps:

  1. Perform Initial Reset: As per the machine’s instructions, press and hold the power button for 5 seconds to clear the error. The dishwasher will drain and power off. Power it back on after a few minutes to see if the error persists.
  2. Verify Incoming Water Supply & Temperature: Ensure the hot water supply valve to the dishwasher is fully open and that the incoming water temperature is at the manufacturer’s recommended level (usually 140°F/60°C for commercial dishwashers). Cold incoming water can strain heating elements and trigger low-temperature errors.
  3. Check Wash Tank Water Level: Confirm that the wash tank fills to the correct operating level. A low water level can expose heating elements or prevent accurate temperature readings, leading to insufficient heating. Inspect the water inlet valve and level sensor if the fill is inadequate.
  4. Inspect Heating Elements: Turn off power to the machine at the breaker. Access the wash tank heating elements (typically found at the bottom of the wash tank). Visually inspect them for signs of damage, burning, or heavy scale buildup. Use a multimeter to check for continuity across the element terminals. Replace any open or shorted heating elements.
  5. Test Wash Tank Temperature Sensor/Thermostat: Locate the temperature sensor or thermostat in the wash tank. Disconnect the sensor and test its resistance using a multimeter, comparing it to the manufacturer’s specified resistance-to-temperature chart. For a thermostat, check for continuity. If it’s faulty, replace the wash tank temperature sensor or thermostat.
  6. Examine Control Board Connections: With power off, inspect all wiring connections leading to the heating elements, temperature sensor, and water level sensor on the main control board. Loose, corroded, or damaged connections can lead to incorrect readings or power delivery issues.
  7. Check for Scale Buildup: Significant lime scale buildup on the heating elements or within the wash tank itself can reduce heating efficiency. Descale the machine according to Hobart’s recommended procedures using appropriate commercial descaling agents.
  8. Consult Technical Manual or Hobart Service: If all basic troubleshooting steps fail, the issue may stem from a faulty main control board or a more complex internal component. Refer to the detailed service manual for advanced diagnostics or contact Hobart Service for professional assistance.

Common Questions:

Q: What does error code 007 on a Hobart LXn/LXGn dishwasher signify?

A: Error code 007 indicates that the wash tank temperature has fallen to 32°F (0°C) or lower. This critical condition prevents the dishwasher from achieving the necessary temperatures for effective sanitization.

Q: Can I continue to use my Hobart LXn/LXGn dishwasher with error 007?

A: No, it is not recommended to operate the dishwasher with error code 007. The machine cannot reach the required sanitizing temperatures, which means dishes will not be properly cleaned and could pose a health risk.

Q: What are the most common causes for the wash tank temperature being too low?

A: The most common causes include faulty or failed heating elements, a malfunctioning wash tank temperature sensor or thermostat, insufficient hot water supply to the machine, or a critically low water level in the wash tank.

When to call a technician

For this error, we recommend calling a certified technician. Do not continue operation or attempt repair yourself.

  • Equipment shows a critical or stop-operation fault.
  • You smell gas, burning, or see smoke or sparks.
  • Error returns after following the steps above.
  • You are not trained to work on this equipment.
  • Warranty or safety could be affected by DIY repair.

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