Error Code
high
Hobart LXe – LXe Will Not Drain
On your LXe SERIES DISHWASHERS unit, a "machine will not drain" issue…
Hobart LXe - Error BOOSTER TEMP SENSOR: Booster Temperature Sensor Error
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 LXe SERIES DISHWASHERS unit, a BOOSTER TEMP SENSOR error indicates the booster temperature probe is either open, shorted, or reporting a value outside its operational range. While the machine continues to cycle, wash performance and sanitization may be compromised. Promptly inspect the sensor wiring and the sensor itself for faults.
Technical Details
Repair Steps:
- Disconnect Power: Always begin by completely disconnecting the dishwasher from its electrical power supply to ensure safety before performing any inspections or repairs.
- Locate the Booster Temperature Sensor: Identify the booster heater section of your LXe SERIES dishwasher. The temperature sensor (thermistor) will typically be threaded into a well or directly into the booster tank.
- Inspect Wiring and Connections: Visually check the wiring connected to the booster temperature sensor. Look for any signs of damage, cuts, fraying, or loose connections. Ensure connectors are clean and securely seated. Corroded or burnt wires can indicate an open circuit or poor contact.
- Test Sensor Continuity and Resistance:
- Disconnect the sensor from the control board.
- Using a multimeter, test for continuity across the sensor leads. An "OPEN" error often means no continuity, while a "SHORT" error might show very low or zero resistance when it shouldn’t.
- Measure the resistance (Ohms) of the sensor. Compare this reading against the manufacturer’s specifications for the booster thermistor at ambient temperature. Significant deviation (e.g., infinite resistance for an open circuit, or near zero for a short) confirms a faulty sensor.
- Check Control Board Connections: Trace the sensor wiring back to the control board. Ensure the connector at the control board is clean, secure, and free from corrosion or damage. A poor connection here can mimic a sensor fault.
- Replace the Booster Temperature Sensor: If the sensor tests as open, shorted, or outside its specified resistance range, it must be replaced with a genuine HOBART replacement part. Ensure the new sensor is properly installed and sealed (if applicable) to prevent leaks.
- Restore Power and Test: Once the sensor is replaced and all connections are secure, restore power to the unit. Run several wash cycles, monitoring the booster temperature readings to confirm the error is resolved and proper sanitization temperatures are achieved.
Common Questions:
Q: What does "OPEN or SHORT" mean for a temperature sensor on a HOBART LXe?
A: An "OPEN" circuit means there’s a break in the wiring or within the sensor itself, preventing electrical current from flowing and thus providing no reading. A "SHORT" circuit means current is taking an unintended, low-resistance path, often resulting in an incorrect, usually very low, temperature reading.
Q: Can I continue operating my HOBART LXe dishwasher with a BOOSTER TEMP SENSOR error?
A: While your machine may continue to run cycles, the booster heater’s temperature regulation will be compromised. This can lead to inadequate wash and rinse temperatures, potentially failing to meet sanitization standards, which is critical in commercial kitchens.
Q: Why is the booster water temperature so crucial in commercial dishwashers?
A: The booster heater is crucial for ensuring the final rinse water reaches specific high temperatures (typically 180-195°F or 82-90°C) required for proper sanitization. Without correct booster temperatures, dishes may not be sanitized effectively, posing health risks and potentially violating health 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.