Vaillant Intermittent Cloud Connectivity

Vaillant smart thermostat frequently loses connection to the Vaillant app, showing offline status intermittently.

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Possible Causes

Unstable home Wi‑Fi, Router power saving or frequent reboots, Poor placement of Vaillant internet module, Overloaded or outdated router firmware

How to Fix / Troubleshooting

Safety: Network‑only work.

  • 1. Check router uptime: Ensure the router is not rebooting frequently due to power saving or instability. Disable aggressive power‑saving features.
  • 2. Improve signal: Move the Vaillant internet module closer to the router or use a wired Ethernet connection if supported.
  • 3. Assign static IP: In the router settings, reserve a static IP for the Vaillant gateway to avoid DHCP issues.
  • 4. Update router firmware: Install the latest firmware for your router to improve stability.
  • 5. Monitor with ping: Use a computer to ping the gateway’s IP over time to confirm if dropouts are local network issues. If only the Vaillant device drops, consider replacing the gateway.
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Repair Difficulty

Easy 2/5

Required Part

Vaillant internet gateway (VR 920 / VR 921)
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