diff --git a/devices/__init__.py b/devices/__init__.py
index 9b38160..d9f1881 100644
--- a/devices/__init__.py
+++ b/devices/__init__.py
@@ -801,7 +801,7 @@ class brennenstuhl_heatingvalve(base):
                               self.KEY_CHILD_LOCK: "UNLOCK", self.KEY_VALVE_DETECTION: "ON", self.KEY_SYSTEM_MODE: "heat"}))
 
     def warning_call_condition(self):
-        return self.get(self.KEY_BATTERY) <= BATTERY_WARN_LEVEL
+        return self.get(self.KEY_BATTERY, 100) <= BATTERY_WARN_LEVEL
 
     def warning_text(self):
         return "Low battery level detected for %s. Battery level was %.0f%%." % (self.topic, self.get(self.KEY_BATTERY))