119
Ariston
Non-Volatile Memory (NVM) Write Failure
Thermostat displays error 119 and cannot save new schedules or settings; changes are lost after reboot.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Corrupted internal flash memory, Firmware bug, Power loss during previous firmware update, Defective PCB
How to Fix / Troubleshooting
Safety: No mains work required for software steps; isolate power only if instructed by the manual.
- Factory reset: Perform a full factory reset from the installer menu. Reconfigure the thermostat and test if schedules now save correctly.
- Firmware reflash: If supported, update or reflash the firmware using the Ariston app or a USB/SD method described in the manual.
- Avoid power cuts during update: Ensure stable power and do not interrupt the device while updating firmware.
- Replace unit: If NVM errors persist, the internal memory chip is likely defective and the thermostat should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Ariston Smart Thermostat (Complete Unit)
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