Newco Bistro Touch Error Code Overheat Error: Water Too Hot
Overheat Error means the brewer found an overheat condition and shows a Call For Service screen. The manual lists a failed thermistor, a failed relay and control board failure as causes.
High: the water may overheat and the brewer stops on a Call For Service screen.
- Code
- Overheat Error
- 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 Overheat Error mean?
The Bistro Touch watches the tank temperature and cuts the heater if it gets too hot. When it finds an overheat condition, it stops and shows a Call For Service screen reading Overheat Error. The manual lists three causes: the thermistor has failed, the relay has failed, or the control board has failed. The actions are to replace the thermistor, replace the relay, and replace the control board, the last marked as requiring service. A thermistor that reads low would make the control keep heating, and a relay stuck closed would keep the heater powered, so either could drive the water past its limit. The manual does not say which is more common, so a technician tests each before replacing anything.
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 Overheat Error
- Water hotter than usual or steaming from the tank
- Brewer stopping the brew
Possible causes
Listed in Newco's documentation
- Thermistor has failed
- Relay has failed
- Control board failure
Other likely causes — what usually sits behind Overheat Error on this control. A technician confirms which one it is before any part is replaced.
- Heater relay contacts welded closed
- Thermistor reading lower than the real temperature
- Tank empty or low while the heater is on
- Heavy scale insulating the sensor from the water
Safe checks before calling for service
- Switch the brewer off and unplug it, then let it cool.
- Check that the water supply is on and the tank can fill.
- Plug in and switch on again to see whether the screen returns.
- If Overheat Error comes back, call for service.
- Report whether steam or unusual heat came from the brewer.
How a technician diagnoses Overheat Error
- Read the screen and confirm Overheat Error.
- Check actual water temperature against the thermistor reading.
- Test the heater relay for sticking.
- Check the control board output to the heater.
- Replace the failed part and confirm normal temperature control.
- An overheated tank holds scalding water and live heater wiring.
- The relay switches line voltage and must be tested with a meter.
- The manual marks board replacement as requiring service.
How Overheat Error differs from similar codes
Heater Error means the water is not heating as expected. Overheat Error means the water is too hot.
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
Is Overheat Error dangerous?
The water may be hotter than intended, so let the brewer cool and do not use it until it is checked.
Is it the same as Heater Error?
No. Heater Error lists a thermistor reset and the tank element. Overheat Error lists the thermistor, relay and board.
Which part is most likely?
The manual does not rank the causes. A technician tests each one.
Need help with Newco Overheat Error?
A technician confirms the cause on site and gives you the price in writing before any work starts.