Hobart LXn/LXGn - Error 015: Booster Pressure Sensor Failure

🛑 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 LXn/LXGn SERIES DISHWASHERS unit, error code 015 indicates the minimum booster water level hasn't been reached, preventing operation, often due to a booster pressure sensor failure. This stops the machine for safety and sanitization. Verify water supply and inspect the booster level sensor and its connections.

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Technical Details

Repair Steps:

  1. Perform Initial Reset: Press and hold the power button for 5 seconds to clear the error, allowing the machine to drain and power off. If the error persists upon restart, proceed to further diagnostics.
  2. Verify Water Supply: Ensure adequate cold water supply pressure to the dishwasher. Check that the main incoming water valve is fully open and that there are no kinks or obstructions in the supply line to the machine.
  3. Inspect Booster Fill Valve: Locate the booster fill valve and check for proper operation. Debris or scale can prevent it from opening fully or closing, leading to incorrect water levels. Test for voltage to the valve if it’s not opening during a fill cycle.
  4. Examine Booster Heater Tank: Power off and disconnect the machine from the electrical supply. Access the booster heater tank and visually inspect for excessive scale buildup that might be covering the level sensor or interfering with water movement. Clean as necessary using a descaling solution appropriate for dishwashers.
  5. Check Booster Pressure/Level Sensor:
    • Locate the booster pressure sensor (or level sensor) typically mounted on or near the booster tank.
    • Inspect its wiring harness for any loose connections, corrosion, or damage. Re-seat any loose connectors.
    • If accessible, remove the sensor and check for scale buildup on the sensor probe itself. Clean gently if needed.
  6. Test Sensor Functionality: With a multimeter, and referencing the Hobart LXn/LXGn service manual for specific values, test the sensor’s continuity or resistance. A faulty sensor will often show an open circuit or incorrect resistance readings. If it’s a pressure switch type, test for continuity in both normal and activated states (e.g., when the booster tank is filled).
  7. Inspect Wiring Harness: Trace the wiring from the booster pressure sensor back to the main control board. Look for any cuts, pinches, or signs of damage. Test for continuity through the wiring if suspicious.
  8. Consider Control Board: If the sensor tests good, wiring is intact, and water supply is confirmed, the issue might be with the main control board’s input for the sensor. This is a last resort and typically requires a Hobart service technician.

Common Questions:

Q: What is the booster pressure sensor and why is it important?

A: The booster pressure sensor on your Hobart LXn/LXGn dishwasher monitors the water level within the booster heater. It’s crucial because the booster heats water to high temperatures for final rinse sanitization. If the water level is too low, the heating element could be damaged or the rinse water may not reach the required sanitizing temperature, making the machine unsafe and ineffective.

Q: Can I reset the error code myself?

A: Yes, the initial step to clear error 015 is to press and hold the power button for 5 seconds. This will drain the machine and power it off. If the error reappears upon restarting, the underlying issue (likely the sensor or water supply) still needs to be addressed professionally.

Q: Why would the booster water level be low if my water supply is fine?

A: Even with good main water supply, the booster’s water level can be low due to several reasons, including a clogged or faulty booster fill valve, scale buildup within the booster tank affecting the level sensor, or a defective level sensor itself providing incorrect readings to the control board.

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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