diff --git a/plugwise/helper.py b/plugwise/helper.py
index a98fbaeb7..786f9ff4f 100644
--- a/plugwise/helper.py
+++ b/plugwise/helper.py
@@ -457,7 +457,7 @@ def _appliance_info_finder(self, appliance: etree, appl: Munch) -> Munch:
                 return None
 
             # Find the valid heater_central
-            if (result := self._check_heater_central() is None:
+            if (result := self._check_heater_central()) is None:
                 return None
             self._heater_id = result