Internal error
Vaillant vSMART
Controller Software Exception
vSMART thermostat or app briefly shows 'Internal error' or similar generic message and may 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
Temporary firmware glitch, memory corruption due to power spikes, overheating of thermostat or gateway, incompatible configuration data after update
How to Fix / Troubleshooting
Steps to stabilize system:
- Power cycle: Turn off power to the thermostat/gateway for 1–2 minutes, then restore power.
- Check ventilation: Ensure the gateway and thermostat are not installed in very hot, enclosed spaces. Provide airflow and avoid direct sunlight.
- Firmware update: Use the app to check for and install any available firmware updates.
- Factory reset (last resort): If errors persist, back up or note your schedules, then perform a factory reset and reconfigure the system.
If internal errors continue after reset and updates, the device may have a hardware fault and should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
vSMART Internet Gateway
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