diff --git a/src/pyatmo/room.py b/src/pyatmo/room.py
index d8065ec7..28578bb0 100644
--- a/src/pyatmo/room.py
+++ b/src/pyatmo/room.py
@@ -93,7 +93,11 @@ def update(self, raw_data: RawData) -> None:
 
         self.heating_power_request = raw_data.get("heating_power_request")
         self.humidity = raw_data.get("humidity")
-        self.reachable = raw_data.get("reachable")
+        if self.climate_type == DeviceType.BNTH:
+            # BNTH is wired, so the room is always reachable
+            self.reachable = True
+        else:
+            self.reachable = raw_data.get("reachable")
         self.therm_measured_temperature = raw_data.get("therm_measured_temperature")
         self.therm_setpoint_mode = raw_data.get("therm_setpoint_mode")
         self.therm_setpoint_temperature = raw_data.get("therm_setpoint_temperature")