BUNN Slush Machine Message LEFT/RIGHT TEMPERATURE SENSOR SHORTED/OPEN
LEFT/RIGHT TEMPERATURE SENSOR SHORTED/OPEN means a sensor on that side is shorted or open. Add product to the minimum fill line. If it continues, record the temperature and torque numbers by holding Left and Right Dot for 5 seconds, and call for service with those numbers.
Medium: one side loses its sensor protection and needs service if it continues.
- Code
- LEFT/RIGHT TEMPERATURE SENSOR SHORTED/OPEN
- Maker
- BUNN
- Equipment
- Slush & frozen drinks
- Applies to
- Ultra NX frozen beverage dispenser
What does BUNN LEFT/RIGHT TEMPERATURE SENSOR SHORTED/OPEN mean?
The Ultra NX guide says the sensors involved are the torque sensor and the hot gas thermistor. It does not say the message refers to a barrel temperature sensor. The control watches both: the torque sensor tells it how hard the auger is working, and the hot gas thermistor tells it the temperature of the refrigerant gas used for freezing and defrost. If either reads as a short or an open circuit, the control cannot manage that side safely and displays the message. The guide's action is practical. First make sure the product level reaches the minimum fill line. If the message continues, hold the Left and Right Dot for 5 seconds to see the temperature and torque numbers, write them down, and call for service with them. The listed causes are a torque sensor that is shorted or open, and a hot gas thermistor that is shorted or open.
Affected models and control systems
BUNN Ultra NX frozen beverage dispensers. Other BUNN frozen drink machines use different messages.
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
- LEFT or RIGHT TEMPERATURE SENSOR SHORTED/OPEN on the display
- One side not freezing
- Torque or temperature numbers look odd
Possible causes
Listed in BUNN's documentation
- Torque sensor shorted/open
- Hot gas thermistor shorted/open
Other likely causes — what usually sits behind LEFT/RIGHT TEMPERATURE SENSOR SHORTED/OPEN on this control. A technician confirms which one it is before any part is replaced.
- Sensor wire damaged during cleaning of the barrel area
- Connector loosened by vibration
- Moisture in the sensor connector
Safe checks before calling for service
- Check that the product level reaches the minimum fill line and add product if it does not.
- Hold the Left and Right Dot for 5 seconds to see the temperature and torque numbers.
- Write down both numbers and which side shows the message.
- Call for service and give those numbers.
How a technician diagnoses LEFT/RIGHT TEMPERATURE SENSOR SHORTED/OPEN
- Read the message and the recorded temperature and torque numbers.
- Measure the resistance of the hot gas thermistor.
- Check the torque sensor signal and wiring.
- Inspect the connectors for moisture or damage.
- Replace the sensor that fails.
- The sensors connect to the live control.
- The hot gas line is part of the sealed refrigeration system.
- Wrong readings can let the barrel overfreeze or run too warm.
How LEFT/RIGHT TEMPERATURE SENSOR SHORTED/OPEN differs from similar codes
This message covers sensors on the left or right side. The CHECK PRODUCT MIX message is about thickness, not a sensor.
Technical reference
- Maker documentation
- BUNN owner support
- Edition
- 58028.0000 B 2/22
- Models / control
- Ultra NX frozen beverage dispenser
- Section
- Warnings & Error Messages table, side 1
- 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 BUNN slush & frozen drink error codes
Why add product first?
The guide says to fill to the minimum line, since low product can trigger sensor readings.
What are the numbers for?
The technician uses the temperature and torque numbers to diagnose.
Does it say barrel sensor?
No. The guide names the torque sensor and the hot gas thermistor.
Need help with BUNN LEFT/RIGHT TEMPERATURE SENSOR SHORTED/OPEN?
A technician confirms the cause on site and gives you the price in writing before any work starts.