Error Code
medium
Hobart LXn/LXGn – LXn/LXGn Will Not Drain
On your HOBART LXn/LXGn SERIES DISHWASHERS unit, a "Machine Will Not Drain"…
Hobart LXn/LXGn - Error 071: Minimum Rinse Temperature Not Reached
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 071 signifies the final rinse temperature failed to meet the required sanitization set point. Common culprits include a faulty rinse heating element, a defective rinse temperature sensor (thermistor), or inadequate water supply. Diagnose these components to restore crucial sanitization performance.
Technical Details
Repair Steps:
- Verify Incoming Water Supply and Pressure: Ensure the hot water supply valve to the dishwasher is fully open and that incoming water pressure meets Hobart specifications (typically 15-25 PSI flowing). Low pressure or restricted flow can prevent proper fill and heating. Check the incoming water temperature to ensure it’s at least 140°F (60°C) before entering the booster heater, if applicable. Inspect rinse manifold and nozzles for any blockages or scale buildup.
- Inspect Rinse Heating Element: This is a common failure point. Disconnect power to the dishwasher and access the rinse tank or booster heater area. Use a multimeter to test the continuity of the rinse heating element. An open circuit (infinite resistance) indicates a failed element that requires replacement. Visually inspect for physical damage, corrosion, or signs of overheating.
- Check Rinse Temperature Sensor (Thermistor/RTD): The temperature sensor provides feedback to the control board. With power disconnected, test the resistance of the thermistor/RTD using a multimeter. Compare the reading to the manufacturer’s resistance chart (if available for specific models) at ambient temperature. A reading far outside the expected range, or an open/shorted circuit, indicates a faulty sensor that needs replacement.
- Examine Heating Element Contactor/Relay: If the heating element tests good, the contactor or relay responsible for supplying power to it might be faulty. With power disconnected, visually inspect the contactor for signs of arcing or burning. When power is applied (carefully, by a qualified technician), verify that the contactor coil energizes and the contacts close to supply voltage to the heating element during the rinse cycle. A faulty contactor will prevent the element from heating.
- Evaluate Control Board (PCB): As a last resort, if all other components (heating element, sensor, contactor, water supply) test good, the issue could stem from a faulty control board. The PCB might not be sending the correct commands to the contactor or misinterpreting sensor signals. This usually requires professional diagnosis and replacement by a Hobart-certified technician.
- Clear Error and Test: After performing any repairs or replacements, press the ENTER button on the control panel to clear the 071 error. Run several wash cycles, closely monitoring the rinse temperature displayed on the control panel (if available) or using an external thermometer, to ensure the machine consistently reaches and maintains the minimum set point requirement.
Common Questions:
Q: What is the minimum rinse temperature for Hobart LXn/LXGn dishwashers?
A: For proper sanitization, Hobart LXn/LXGn dishwashers typically require a minimum final rinse temperature of 180°F (82°C), though specific health code requirements and machine programming may vary.
Q: How do I test the rinse heating element on my Hobart dishwasher?
A: To test the rinse heating element, first disconnect power to the unit. Then, use a multimeter set to ohms to check for continuity across the element’s terminals. An open circuit (no continuity) indicates the element has failed and needs replacement.
Q: Can low water pressure cause a rinse temperature error (071)?
A: Yes, absolutely. Insufficient incoming water pressure or flow can prevent the rinse tank from filling adequately or hinder efficient heat transfer, making it difficult for the heating element to reach and maintain the required rinse temperature, thus triggering error 071.
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.