Nuova Simonelli Aurelia II Message Boiler over 130 C
Boiler over 130 C appears on Nuova Simonelli Aurelia II machines (Digit, V and S) when the machine temperature goes above 130 C. The display flashes and the heating resistor switches off, and heating resumes once the temperature falls below 130 C. Switch the machine off, let it cool completely and keep clear of hot parts.
High: an over-temperature boiler is a burn and equipment risk, and the machine stops heating.
- Code
- Boiler over 130 C
- Maker
- Nuova Simonelli
- Equipment
- Espresso machines
- Applies to
- Aurelia II Digit / V / S
What does Nuova Simonelli Boiler over 130 C mean?
The boiler on an Aurelia II machine has an electronic temperature probe, and the control uses it to switch the heating resistor on and off. When the machine temperature goes above 130 C, the control treats it as too hot, the display flashes the message Boiler over 130 C and the heating resistor is switched off. Heating resumes once the temperature falls below 130 C, so a single event can be self-correcting. The boiler also has a safety thermostat behind that control, and that thermostat must be reset by hand. The reset is a technician's job, because it means the electronic control did not hold the temperature and the machine went up to a point where only the second protection responds. The causes in the handbook are the temperature probe and its reading, a heating control that stays on, scale insulating the heater, and the manual-reset safety thermostat. Scale is a likely background cause in hard-water cities, because a coating on the heater makes it overheat before the water around it warms.
Affected models and control systems
This applies to Nuova Simonelli Aurelia II machines in the Digit, V and S versions (User Handbook, March 2012).
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
- Flashing Boiler over 130 C message
- Heating stopped and the machine cooling down
- Steam or hot water not coming back as usual
- Machine refusing to heat after it cools
Possible causes
Listed in Nuova Simonelli's documentation
- Temperature probe reading wrongly
- Heating control staying on
- Scale insulating the heater
- Manual-reset safety thermostat tripped
Other likely causes — what usually sits behind Boiler over 130 C on this control. A technician confirms which one it is before any part is replaced.
- Water softener cartridge exhausted so scale builds fast
- Heating relay contacts welded closed
- Probe pocket loose, so the probe reads lower than the boiler
Safe checks before calling for service
- Switch the machine off and let it cool completely.
- Keep everyone clear of the boiler, wand and group, since they are very hot.
- Do not open the machine or press any safety reset yourself.
- If heating does not come back by itself, call us and tell us the model and how often the message appears.
How a technician diagnoses Boiler over 130 C
- Read the message and confirm the boiler temperature with the machine's probe reading.
- Check the probe and its connection.
- Test the heating control and relay for sticking.
- Inspect the heater and boiler for scale.
- Test and reset the safety thermostat only after the cause is found.
- The boiler and heater run at high temperature and pressure and can cause severe burns.
- The safety thermostat protects against overheating, and resetting it before finding the cause is dangerous.
- Heating elements and relays carry live line voltage.
How Boiler over 130 C differs from similar codes
DIAGNOSIS OF ERROR blocks all functions at start-up. Boiler over 130 C is a temperature message and clears when the boiler cools.
Technical reference
- Document
- Aurelia II (S, V, Digit) User Handbook March 2012, Function Messages p.75-78
- Edition
- March 2012 (Marzo 2012); no part number printed
- Models / control
- Aurelia II Digit / V / S
- Section
- 10. Aurelia Digit Machine Function Messages, p. 75-76 (messages listed as DIAGNOSIS OF ERROR, DELIVERY ERROR, DOSER ERROR, LEVEL ERROR, PRESSURE ERROR, OVERCURRENT ERR., FINE GRINDING, COARSE GRINDING); 11. Aurelia V, p. 77; 12. Aurelia S, p. 78
- 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 Nuova Simonelli espresso machine error codes
Will it start heating again?
Heating resumes once the temperature falls below 130 C, unless the safety thermostat tripped.
Can I press the safety reset?
No. That is a technician's job, after finding why the boiler overheated.
Is scale really involved?
It can be. Scale insulates the heater and raises its temperature.
Need help with Nuova Simonelli Boiler over 130 C?
A technician confirms the cause on site and gives you the price in writing before any work starts.