A room shows no temperature ("—")
Usually a sleepy or flat sensor — here's what we do and what to check.
If a room shows "—" instead of a temperature, its thermometer hasn't reported recently. Smart Property automatically falls back to the radiator valve's built-in temperature where one is present, so heating keeps working.
What to check
- The room's thermometer battery — a flat battery is the most common cause. Replace it.
- That the sensor is within range of its hub.
- Give it a few minutes after a battery change to start reporting again.
If there's a valve in the room, heating continues on the valve's own reading meanwhile — you won't be left cold.