diff --git a/custom_components/versatile_thermostat/base_thermostat.py b/custom_components/versatile_thermostat/base_thermostat.py
index 9f69759..87282b1 100644
--- a/custom_components/versatile_thermostat/base_thermostat.py
+++ b/custom_components/versatile_thermostat/base_thermostat.py
@@ -371,7 +371,7 @@ class BaseThermostat(ClimateEntity, RestoreEntity, Generic[T]):
             self._tpi_coef_ext = 0
 
         self._minimal_activation_delay = entry_infos.get(CONF_MINIMAL_ACTIVATION_DELAY)
-        self._minimal_deactivation_delay = entry_infos.get(CONF_MINIMAL_DEACTIVATION_DELAY)
+        self._minimal_deactivation_delay = entry_infos.get(CONF_MINIMAL_DEACTIVATION_DELAY, 0)
         self._last_temperature_measure = self.now
         self._last_ext_temperature_measure = self.now
 
diff --git a/custom_components/versatile_thermostat/prop_algorithm.py b/custom_components/versatile_thermostat/prop_algorithm.py
index 027e86a..4c4679f 100644
--- a/custom_components/versatile_thermostat/prop_algorithm.py
+++ b/custom_components/versatile_thermostat/prop_algorithm.py
@@ -196,7 +196,7 @@ class PropAlgorithm:
         if self._off_time_sec < self._minimal_deactivation_delay:
             if self._off_time_sec > 0:
                 _LOGGER.info(
-                    "%s - Force 100% heating cycle since the off duration (%f) is shorter than minimal_deactivation_delay (%f)",
+                    "%s - Force 100%% heating cycle since the off duration (%f) is shorter than minimal_deactivation_delay (%f)",
                     self._vtherm_entity_id,
                     self._off_time_sec,
                     self._minimal_deactivation_delay,