Error Code
high
Hobart LXe – LXe Will Not Drain
On your LXe SERIES DISHWASHERS unit, a "machine will not drain" issue…
Hobart LXe - Error SUMP LEVEL SENSOR: Sump Pressure Switch 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 LXe SERIES DISHWASHERS unit, a SUMP LEVEL SENSOR error indicates the sump pressure switch is out of its normal operating range. This prevents the machine from starting or running cycles. Common causes include a faulty switch, wiring issues, or blockages affecting sump water levels.
Technical Details
Repair Steps:
- Safety First: Disconnect the dishwasher from the main power supply before performing any inspection or repair.
- Inspect Sump and Drain Line: Physically check the dishwasher’s sump for any debris, food particles, or chemical residue that might be obstructing the pressure switch sensing port or preventing proper water flow. Ensure the drain line isn’t clogged, which could affect sump levels.
- Verify Wiring and Connections: Locate the sump pressure switch (often mounted near the sump or drain pump). Carefully inspect its wiring harness for any signs of damage, cuts, pinches, or loose connections. Use a multimeter to check for continuity on wires specified as “OPEN or SHORT” in the error description. Ensure connectors are securely seated.
- Test the Sump Pressure Switch: With power disconnected, disconnect the wiring from the pressure switch. Use a multimeter to test the switch’s continuity in both its ‘open’ and ‘closed’ states (e.g., by simulating water level or using air pressure if it’s a diaphragm type). A faulty switch will not change states or show incorrect resistance/continuity readings.
- Examine the Control Board: If the switch and wiring appear good, the issue might stem from the main control board not correctly reading the switch’s input or providing necessary voltage. This is a more advanced diagnosis requiring schematic knowledge and professional tools. Look for visible signs of damage like burnt components on the board.
- Replace Faulty Components: If testing confirms a faulty sump pressure switch or damaged wiring, replace the specific component. Ensure the replacement part is an OEM equivalent for your HOBART LXe series dishwasher. After replacement, reassemble, restore power, and test machine operation.
Common Questions:
Q: What does the sump level sensor (pressure switch) do in my Hobart LXe?
A: The sump level pressure switch monitors the water level inside the dishwasher’s sump. It ensures proper water fill for wash cycles and prevents dry-firing of heating elements or pumps, critical for safe and efficient operation.
Q: Can I reset the SUMP LEVEL SENSOR error myself?
A: The error typically clears once the underlying issue (faulty switch, wiring, or blockage) is resolved. While power cycling can sometimes clear transient errors, a persistent SUMP LEVEL SENSOR error requires physical inspection and repair rather than just a reset.
Q: Is it safe to operate my dishwasher with a SUMP LEVEL SENSOR error?
A: No. Your HOBART LXe series dishwasher is designed to prevent operation when this error occurs because it directly impacts safe water levels and potentially heating element protection. Operating it could lead to damage or safety hazards.
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.