Newco Bistro Touch Error Code Thermistor Error Open: Open Sensor
Thermistor Error Open means the thermistor reads open, and the brewer shows a Call For Service screen. The manual lists a thermistor that is not plugged in, a failed thermistor and control board failure. The first step is to ensure all thermistor connections are secure.
High: the brewer cannot read temperature and stops.
- Code
- Thermistor Error Open
- Maker
- Newco
- Equipment
- Coffee brewers
- Applies to
- Newco Bistro Touch (the LCD Touch manual PN 122117 20260630 prints the same error chart)
What does Newco Thermistor Error Open mean?
The control reads the tank thermistor's resistance. An open reading is extremely high, as if the wire were cut, and the control shows a Call For Service screen reading Thermistor Error Open. The manual lists three causes: the thermistor is not plugged in, the thermistor has failed, or the control board has failed. The actions are to ensure all thermistor connections are secure, replace the thermistor, and replace the control board, the last marked as requiring service. An unplugged sensor is a literal open circuit, so the connection check is the most direct first step. If the connections are good, the sensor is the next suspect, then the board. This error mirrors Thermistor Error Short, which lists the same three causes.
Affected models and control systems
Newco Bistro Touch brewers. The LCD Touch manual (PN 122117, 20260630) prints the same error chart.
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
- Call For Service screen showing Thermistor Error Open
- Brewer not heating
- Display clearing and returning after a restart
Possible causes
Listed in Newco's documentation
- Thermistor not plugged in
- Thermistor has failed
- Control board failure
Other likely causes — what usually sits behind Thermistor Error Open on this control. A technician confirms which one it is before any part is replaced.
- Connector pulled out when the brewer was pulled from the counter
- Lead broken inside the sleeve
- Corrosion at the thermistor pins
- Sensor element open from age
Safe checks before calling for service
- Switch off the brewer and unplug it for a minute.
- Check for spilled water near the base and back without opening panels.
- Plug in and switch on to see whether the screen returns.
- If Thermistor Error Open returns, call for service.
- Tell the technician when the brewer was last moved or cleaned.
How a technician diagnoses Thermistor Error Open
- Read the screen and confirm Thermistor Error Open.
- Ensure all thermistor connections are secure.
- Measure resistance with power off and compare it with the table.
- Check the lead for breaks.
- Replace the sensor, then the board only if needed.
- The thermistor plug is on a board with live line voltage.
- Meter readings are needed to tell an open sensor from an open lead.
- The manual marks board replacement as requiring service.
How Thermistor Error Open differs from similar codes
Thermistor Error Short is the same alarm for a shorted reading. Open is the reading as if the wire were cut.
Technical reference
- Document
- Bistro Touch operation manual
- Edition
- PN 128142 20260513
- Models / control
- Newco Bistro Touch (the LCD Touch manual PN 122117 20260630 prints the same error chart)
- Section
- Servicing the Machine, Error Messages, p. 34
- 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 Newco coffee brewer error codes
What is the first thing to check?
The manual says to ensure all thermistor connections are secure.
Is Open worse than Short?
Neither is ranked in the manual. Both stop the brewer.
Will it clear by itself?
The manual lists no automatic clearing, so expect it to stay until the cause is fixed.
Need help with Newco Thermistor Error Open?
A technician confirms the cause on site and gives you the price in writing before any work starts.