Hobart LXn/LXGn - Error 087: Minimum Final Rinse Temperature Not Reached After Repeating Cycle

⚠️ 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, error code 087 indicates that the final rinse temperature has not reached its set point after a cycle. This typically points to an issue with the machine's ability to heat the final rinse water effectively or accurately sense its temperature. Initiate a power cycle by holding the power button for 5 seconds to clear the error, then observe if it reoccurs.

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Technical Details

Repair Steps:

  1. Clear the Error and Test: As per the machine’s instructions, press and hold the power button for 5 seconds until the machine drains and powers off. Turn the machine back on and run a test cycle. If the error persists, proceed with further diagnostics.
  2. Verify Incoming Hot Water Supply: Ensure the hot water supply to the dishwasher meets the manufacturer’s recommended temperature (typically 120-140°F or 49-60°C). If the incoming water is too cold, the booster heater may struggle to reach the final rinse set point.
  3. Inspect the Booster Heater System: The booster heater is responsible for raising the final rinse water to the required sanitizing temperature (e.g., 180°F/82°C).
    • Check Heater Elements: Turn off power and use a multimeter to check for continuity of the booster heater elements. Replace if open circuit.
    • Examine Booster Contactor/Relay: Verify the contactor or relay that controls power to the booster heater is engaging properly and not stuck open or closed.
    • Reset High-Limit Thermostat: Many booster heaters have a manual reset high-limit thermostat. Locate and press the reset button. If it trips repeatedly, investigate potential causes like inadequate water flow or faulty elements.
  4. Test the Final Rinse Temperature Sensor (RTD): The machine relies on an RTD (Resistance Temperature Detector) sensor to monitor the final rinse temperature. Turn off power, locate the sensor, and measure its resistance. Compare the reading to the manufacturer’s specifications (found in the service manual) for expected resistance at ambient temperature. A faulty sensor will provide incorrect readings to the control board.
  5. Check Rinse Arm and Nozzles: Clogged or damaged rinse arm nozzles can cause uneven water distribution and localized temperature discrepancies, leading the sensor to read below the set point. Ensure all nozzles are clear and the rinse arm spins freely.
  6. Verify Rinse Solenoid Valve Operation: The final rinse solenoid valve controls the flow of water during the rinse cycle. Ensure it is opening fully and allowing adequate water flow. A partially obstructed or faulty valve can restrict flow and impact heating efficiency.
  7. Inspect Control Board and Wiring: Visually inspect the main control board for any signs of damage (burnt components, corrosion). Check all wiring connections, especially those to the booster heater, temperature sensor, and rinse valve, for looseness or damage. A communication issue or faulty input on the control board could misinterpret the temperature.

Common Questions:

Q: Why is the final rinse temperature so critical on my Hobart dishwasher?

A: The final rinse temperature is crucial for proper sanitization. Commercial dishwashers rely on high temperatures (typically 180°F/82°C) during the final rinse to kill bacteria and ensure dishes meet health code standards. If this temperature isn’t met, dishes are not adequately sanitized.

Q: Can I manually adjust the final rinse temperature set point?

A: The final rinse temperature set point is usually a fixed or factory-calibrated setting to meet sanitization standards and cannot be freely adjusted by the operator. Technicians with access to service menus might be able to verify or fine-tune it within a narrow range, but a persistent low temperature typically indicates a component fault rather than an incorrect setting.

Q: What happens if I continue to use the dishwasher with error 087 active?

A: Continuing to use the machine with error 087 means your dishes are not reaching the required sanitization temperature. This poses a significant health risk and could lead to health department violations. It’s imperative to address the underlying cause of the temperature issue immediately to ensure food safety and compliance.

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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