Smart thermostat unable to connect to WiFi
4.5
The thermostat works manually but cannot be controlled via the app.
Symptoms
- WiFi icon with exclamation
- "Network Error"
- App says "Offline"
Possible Causes
- Low power (no C-wire)
- Weak signal
- Router settings
Step-by-Step Fix
1
Check Battery Level
If power is low, the thermostat will disable WiFi to save energy.
2
Restart Router
Clears IP conflicts that might block the thermostat.
3
Use 2.4GHz WiFi
Most thermostats do not support 5GHz networks.
When to See a Technician
Without a C-wire, the thermostat "steals" power from the HVAC, which often isn't enough to keep WiFi active.
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