Why this happens
Unlike the standard G30 — which is Bluetooth-only unless you add the separate GCAST accessory — the G40 and G70/G70² have WiFi built in out of the box. That's what lets you monitor and control your brew remotely from anywhere in (or around) the house, get push notifications through the brew process, and sync recipes straight from the Grainfather community.
Because WiFi is built in rather than added on, connection issues almost always come down to router setup rather than a fault with the unit itself.
Troubleshooting steps
1. Check the distance to your router
Make sure the G40/G70/G70² is within normal WiFi range of your router. If it's brewing in a garage, shed, or a room far from the router, that's the most common reason for a failed connection.
2. Confirm you're on 2.4GHz, not 5GHz
This is the big one. The G40/G70/G70² only supports 2.4GHz WiFi — it will not connect to a 5GHz network. Most modern routers broadcast both bands, sometimes under the same network name. Check your router's settings (or its manual) to confirm 2.4GHz is enabled, and if your router splits the two bands into separate network names, make sure you're selecting the 2.4GHz one specifically.
3. Check your network type
The G40/G70/G70² only supports standard IoT/WiFi-enabled networks. Guest networks, enterprise networks with extra authentication steps, or networks with client isolation turned on can block the connection even when the signal itself looks fine.
4. Still not connecting?
If you've worked through all three checks and it's still not playing ball, get in touch with the Grainfather Customer Services Team — there may be a hardware issue that needs a closer look.
Quick reference
| Check | What to look for |
|---|---|
| Router distance | Unit within normal WiFi range |
| WiFi band | 2.4GHz enabled and selected (not 5GHz) |
| Network type | Standard IoT/WiFi network — not guest/enterprise |
| Still stuck | Contact Customer Services |