Bertazzoni Coffee Machines ERROR - STEAM TEMPERATURE Error: Steam boiler sensor fault
What Does “Error – Steam Temperature” Mean on a Bertazzoni CM24? The Bertazzoni CM24 has two separate boilers — one for brewing espresso and one for producing steam for cappuccino and latte. Each boiler has its own dedicated NTC thermistor. Error – Steam Temperature means the control board has detected an invalid reading from the […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. A steam boiler temperature fault requires professional diagnosis. The steam circuit operates at elevated pressure — do not attempt DIY repair.
Can I reset the code?
No. The use and care manual states "Call for service" for this error. A power cycle after full cool-down may clear a transient fault, but a persistent error requires technician intervention.
When to stop immediately?
Stop if you notice: Error appears immediately on startup even after a full cool-down cycle, Unusual steam venting or hissing from the machine body.
Symptoms You May Notice
Machine starts warming up but halts before reaching steam-ready temperature and locks out all steam and cappuccino functions
The steam boiler must reach a higher operating temperature than the brew boiler. If the NTC sensor reports an impossible value or the boiler times out during warm-up, the control board shuts down the steam circuit and displays the error.
Display reads "Error - Steam Temperature" with all buttons unresponsive; espresso and coffee functions may also be unavailable
In most cases the full machine lockout prevents all drink operations, not just steam-dependent ones, until the steam temperature fault is cleared by a service technician.
Possible Causes
NTC temperature sensor failure on the steam boiler
A separate NTC thermistor monitors the CM24 steam boiler. An open-circuit, shorted, or drifted thermistor causes the control board to register an invalid steam boiler temperature and lock out steam-related functions.
Requires ProfessionalSteam boiler heating element failure
If the steam boiler element fails, the boiler never reaches the required steam temperature within the timeout window. The control board interprets this as a boiler fault and locks out the machine.
Requires ProfessionalSafe Checks You Can Do
-
1
Power cycle after full cool-down
Turn the power switch off and allow the machine to cool completely (at least 30 minutes). Restart and observe whether the error appears during warm-up.
Steam boiler errors can occasionally be triggered by a pressure-relief valve releasing steam unexpectedly. If you heard an unusual hiss or saw steam venting from an unexpected location before the error appeared, report this to the service technician.
When to Call a Professional
Contact a qualified technician if:
- Steam boiler NTC sensor reads outside the expected resistance range at room temperature
- Steam boiler element is open circuit on a continuity test
- Pressure stat or thermal cut-out has tripped permanently and requires manual reset
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
Coffee Machines Repair Service Schedule Appointment