Hobart Commercial Dishwasher Error Code RINSE TEMP SENSOR: Open/Short
RINSE TEMP SENSOR with Service Required and OPEN or SHORT on a Hobart LXe dishwasher means the final rinse temperature probe is out of range. The machine continues to run cycles. Call service.
Medium: the machine runs but the rinse temperature cannot be confirmed.
- Code
- RINSE TEMP SENSOR - Service Required - OPEN or SHORT
- Maker
- Hobart
- Equipment
- Dish machines
- Applies to
- LXe Series
What does Hobart RINSE TEMP SENSOR - Service Required - OPEN mean?
The final rinse probe measures the temperature of the water that sanitizes the dishes. The control compares it with the required rinse temperature. If the probe circuit opens or shorts, the reading is out of range and the display shows RINSE TEMP SENSOR / Service Required (Service Phone Number) / OPEN or SHORT. The machine continues to run cycles, so the operator can finish a rush, but the control cannot confirm that the final rinse reached temperature. That is the point of the probe, so the message is more important in a food operation than it may look. It applies to all four LXe models. The manual's action is to call service. Do not confuse it with LOW RINSE TEMP, which is a real measured cool rinse, whereas this message means the measuring itself has failed. Because the rinse probe sits in the hottest, steamiest part of the machine, its lead and connector are exposed to repeated heating and cooling, which is the usual way such a probe ages out.
Affected models and control systems
Hobart LXe series: LXeC (ML-130191), LXeH (ML-130192), LXePR (ML-130193) and LXeR (ML-130194).
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- RINSE TEMP SENSOR Service Required on the display
- OPEN or SHORT beneath the message
- No reliable rinse temperature reading
Possible causes
Likely causes — what usually sits behind RINSE TEMP SENSOR - Service Required - OPEN on this control. A technician confirms which one it is before any part is replaced.
- Final rinse temperature probe out of range
- Probe lead cracked from heat and steam
- Connector corroded by rinse vapor
- Probe element drifting or failed
- Loose probe plug at the control
Safe checks before calling for service
- Note whether OPEN or SHORT is shown.
- Write down the service number on screen.
- Do not touch the probe or wiring.
- Check dish results and temperature with a test strip if your kitchen uses one.
How a technician diagnoses RINSE TEMP SENSOR - Service Required - OPEN
- Read the message and confirm OPEN or SHORT.
- Measure the probe resistance against the chart.
- Inspect the lead, plug and seat for steam damage.
- Verify actual rinse temperature with a thermometer.
- Replace the probe or repair the wire, then check the readings.
- The probe sits in a hot, wet area of a machine fed by 208-240 V.
- Verifying real rinse temperature independently of the probe takes instruments.
How RINSE TEMP SENSOR - Service Required - OPEN differs from similar codes
RINSE TEMP SENSOR means the probe failed to read; LOW RINSE TEMP means the probe read a rinse that was truly too cool.
Technical reference
- Maker documentation
- Hobart owner support
- Edition
- FORM 38435 (March 2014)
- Models / control
- LXe Series
- Section
- DIAGNOSTIC/ERROR MESSAGES (page 27)
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Hobart dish machine error codes
Is RINSE TEMP SENSOR the same as LOW RINSE TEMP?
No. One is a probe failure, the other a measured cool rinse.
Is the rinse sanitizing properly?
The control cannot confirm it, so check with a thermometer or test strip until it is repaired.
Does the message stop the machine?
No. The machine continues to run cycles.
Need help with Hobart RINSE TEMP SENSOR - Service Required - OPEN?
A technician confirms the cause on site and gives you the price in writing before any work starts.