diff --git a/.coveragerc b/.coveragerc
index daf94cf03b3..c24cb43ffb9 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -6,7 +6,6 @@ omit =
     homeassistant/helpers/signal.py
     homeassistant/helpers/typing.py
     homeassistant/scripts/*.py
-    homeassistant/util/async.py
 
     # omit pieces of code that rely on external devices being present
     homeassistant/components/abode/__init__.py
@@ -32,7 +31,6 @@ omit =
     homeassistant/components/airly/const.py
     homeassistant/components/airvisual/sensor.py
     homeassistant/components/aladdin_connect/cover.py
-    homeassistant/components/alarm_control_panel/manual_mqtt.py
     homeassistant/components/alarmdecoder/*
     homeassistant/components/alarmdotcom/alarm_control_panel.py
     homeassistant/components/alpha_vantage/sensor.py
@@ -261,7 +259,6 @@ omit =
     homeassistant/components/geizhals/sensor.py
     homeassistant/components/gios/__init__.py
     homeassistant/components/gios/air_quality.py
-    homeassistant/components/gios/consts.py
     homeassistant/components/github/sensor.py
     homeassistant/components/gitlab_ci/sensor.py
     homeassistant/components/gitter/sensor.py
@@ -306,7 +303,6 @@ omit =
     homeassistant/components/homematic/notify.py
     homeassistant/components/homeworks/*
     homeassistant/components/honeywell/climate.py
-    homeassistant/components/hook/switch.py
     homeassistant/components/horizon/media_player.py
     homeassistant/components/hp_ilo/sensor.py
     homeassistant/components/htu21d/sensor.py
@@ -534,7 +530,6 @@ omit =
     homeassistant/components/plex/media_player.py
     homeassistant/components/plex/sensor.py
     homeassistant/components/plex/server.py
-    homeassistant/components/plex/websockets.py
     homeassistant/components/plugwise/*
     homeassistant/components/plum_lightpad/*
     homeassistant/components/pocketcasts/sensor.py
@@ -728,7 +723,6 @@ omit =
     homeassistant/components/torque/sensor.py
     homeassistant/components/totalconnect/*
     homeassistant/components/touchline/climate.py
-    homeassistant/components/tplink/device_tracker.py
     homeassistant/components/tplink/switch.py
     homeassistant/components/tplink_lte/*
     homeassistant/components/traccar/device_tracker.py
@@ -753,7 +747,6 @@ omit =
     homeassistant/components/twitch/sensor.py
     homeassistant/components/twitter/notify.py
     homeassistant/components/ubee/device_tracker.py
-    homeassistant/components/uber/sensor.py
     homeassistant/components/ubus/device_tracker.py
     homeassistant/components/ue_smart_radio/media_player.py
     homeassistant/components/unifiled/*
@@ -831,7 +824,6 @@ omit =
     homeassistant/components/zestimate/sensor.py
     homeassistant/components/zha/__init__.py
     homeassistant/components/zha/api.py
-    homeassistant/components/zha/const.py
     homeassistant/components/zha/core/channels/*
     homeassistant/components/zha/core/const.py
     homeassistant/components/zha/core/device.py
@@ -839,7 +831,6 @@ omit =
     homeassistant/components/zha/core/helpers.py
     homeassistant/components/zha/core/patches.py
     homeassistant/components/zha/core/registries.py
-    homeassistant/components/zha/device_entity.py
     homeassistant/components/zha/entity.py
     homeassistant/components/zha/light.py
     homeassistant/components/zha/sensor.py
diff --git a/script/hassfest/__main__.py b/script/hassfest/__main__.py
index 99e32e57f43..a1541ef68c9 100644
--- a/script/hassfest/__main__.py
+++ b/script/hassfest/__main__.py
@@ -1,10 +1,12 @@
 """Validate manifests."""
 import pathlib
 import sys
+from time import monotonic
 
 from . import (
     codeowners,
     config_flow,
+    coverage,
     dependencies,
     json,
     manifest,
@@ -18,6 +20,7 @@ PLUGINS = [
     json,
     codeowners,
     config_flow,
+    coverage,
     dependencies,
     manifest,
     services,
@@ -48,7 +51,17 @@ def main():
     integrations = Integration.load_dir(pathlib.Path("homeassistant/components"))
 
     for plugin in PLUGINS:
-        plugin.validate(integrations, config)
+        try:
+            start = monotonic()
+            print(f"Validating {plugin.__name__.split('.')[-1]}...", end="", flush=True)
+            plugin.validate(integrations, config)
+            print(" done in {:.2f}s".format(monotonic() - start))
+        except RuntimeError as err:
+            print()
+            print()
+            print("Error!")
+            print(err)
+            return 1
 
     # When we generate, all errors that are fixable will be ignored,
     # as generating them will be fixed.
diff --git a/script/hassfest/coverage.py b/script/hassfest/coverage.py
new file mode 100644
index 00000000000..dc94b36e6d8
--- /dev/null
+++ b/script/hassfest/coverage.py
@@ -0,0 +1,50 @@
+"""Validate coverage files."""
+from pathlib import Path
+from typing import Dict
+
+from .model import Config, Integration
+
+
+def validate(integrations: Dict[str, Integration], config: Config):
+    """Validate coverage."""
+    coverage_path = config.root / ".coveragerc"
+
+    not_found = []
+    checking = False
+
+    with coverage_path.open("rt") as fp:
+        for line in fp:
+            line = line.strip()
+
+            if not line or line.startswith("#"):
+                continue
+
+            if not checking:
+                if line == "omit =":
+                    checking = True
+                continue
+
+            # Finished
+            if line == "[report]":
+                break
+
+            path = Path(line)
+
+            # Discard wildcard
+            while "*" in path.name:
+                path = path.parent
+
+            if not path.exists():
+                not_found.append(line)
+
+    if not not_found:
+        return
+
+    errors = []
+
+    if not_found:
+        errors.append(
+            f".coveragerc references files that don't exist: {', '.join(not_found)}."
+        )
+
+    raise RuntimeError(" ".join(errors))