Blank screen, unresponsive, or not controlling your system — here's what's usually behind it.
The most common cause for battery-powered thermostats — worth checking first, even on smart thermostats with battery backup.
Hardwired thermostats rely on power from your HVAC system — a tripped breaker affecting the system will also affect the thermostat.
Loose or miswired connections, especially after a DIY thermostat swap, are a common cause of a thermostat that won't communicate with the system.
The thermostat may be functioning locally but not syncing with the app — worth checking if the physical display still works even if the app doesn't.
Like any electronic device, thermostats can simply fail with age — usually a straightforward replacement.
Many homeowners do for simple swaps, but incorrect wiring can cause system issues or safety problems. We offer smart thermostat installation if you'd rather have it done right the first time.
Not necessarily — check if the physical display still shows temperature and responds to manual adjustment. If so, it's likely a connectivity issue, not a hardware failure.
See our full Smart Thermostat service or browse other common symptoms.