Saunier Duval Region / Country Configuration Error

Thermostat shows E8 and cannot join the Saunier Duval account due to region mismatch

Possible Causes

Thermostat registered in a different country region, App account set to a different region than the device, Unsupported country for cloud services, VPN causing apparent region mismatch

How to Fix / Troubleshooting

Safety: No electrical work required.

Check account region: In the Saunier Duval app, verify your account country matches the country where the thermostat is installed.
Disable VPN: Turn off any VPN on your phone or router during device registration.
Factory reset: Reset the thermostat and repeat the setup, selecting the correct country/region when prompted.

If E8 persists, contact Saunier Duval support to adjust the device region on their servers.

Repair Difficulty

Very Easy 1/5