diff --git a/blueprints/danfoss_ally_trv_external_sensor.yaml b/blueprints/danfoss_ally_trv_external_sensor.yaml
index f5496fa..46325b8 100644
--- a/blueprints/danfoss_ally_trv_external_sensor.yaml
+++ b/blueprints/danfoss_ally_trv_external_sensor.yaml
@@ -53,9 +53,11 @@ conditions:
 # cases.
 - condition: template
   value_template: |-
-    {% if state_attr(temperature_entity, 'temperature') is none %}
+    {# if the temperature entity doesn't have a state, e.g. if it's powered off #}
+    {% if states(temperature_entity) is none %}
     False
-    {% elif state_attr(climate_entity, 'external_measured_room_sensor') == None %}
+    {# if the radiator has been unavailable #}
+    {% elif state_attr(climate_entity, 'external_measured_room_sensor') is none %}
     True
     {% else %}
     {{
@@ -72,7 +74,7 @@ actions:
     # state.
     external_temperature: |-
       {% if (trigger.id is not defined) or (trigger.to_state.state in ['unavailable', 'unknown']) %}
-      {{ state_attr(temperature_entity, 'temperature') }}
+      {{ states(temperature_entity) }}
       {% else %}
       {{ trigger.to_state.state | float }}
       {% endif %}