diff --git a/homeassistant/components/sensor/filter.py b/homeassistant/components/sensor/filter.py
index 93380291a3e..49e9189a84d 100644
--- a/homeassistant/components/sensor/filter.py
+++ b/homeassistant/components/sensor/filter.py
@@ -380,7 +380,7 @@ class RangeFilter(Filter):
             _LOGGER.debug("Lower outlier nr. %s in %s: %s",
                           self._stats_internal['erasures_low'],
                           self._entity, new_state)
-            new_state.state = self._upper_bound
+            new_state.state = self._lower_bound
 
         return new_state
 
diff --git a/tests/components/sensor/test_filter.py b/tests/components/sensor/test_filter.py
index 6fc732b28f5..718c39764d0 100644
--- a/tests/components/sensor/test_filter.py
+++ b/tests/components/sensor/test_filter.py
@@ -141,14 +141,14 @@ class TestFilterSensor(unittest.TestCase):
                            lower_bound=lower,
                            upper_bound=upper)
         for unf_state in self.values:
-            prev = float(unf_state.state)
+            unf = float(unf_state.state)
             filtered = filt.filter_state(unf_state)
-            if prev < lower:
+            if unf < lower:
                 self.assertEqual(lower, filtered.state)
-            elif prev > upper:
+            elif unf > upper:
                 self.assertEqual(upper, filtered.state)
             else:
-                self.assertEqual(prev, filtered.state)
+                self.assertEqual(unf, filtered.state)
 
     def test_throttle(self):
         """Test if lowpass filter works."""