diff --git a/homeassistant/components/openhardwaremonitor/sensor.py b/homeassistant/components/openhardwaremonitor/sensor.py
index fc228ee26fbb..0729943a7702 100644
--- a/homeassistant/components/openhardwaremonitor/sensor.py
+++ b/homeassistant/components/openhardwaremonitor/sensor.py
@@ -7,6 +7,7 @@ import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
 from homeassistant.const import CONF_HOST, CONF_PORT
+from homeassistant.exceptions import PlatformNotReady
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 from homeassistant.util import Throttle
@@ -38,6 +39,8 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
 def setup_platform(hass, config, add_entities, discovery_info=None):
     """Set up the Open Hardware Monitor platform."""
     data = OpenHardwareMonitorData(config, hass)
+    if data.data is None:
+        raise PlatformNotReady
     add_entities(data.devices, True)
 
 
@@ -130,7 +133,7 @@ class OpenHardwareMonitorData:
             response = requests.get(data_url, timeout=30)
             self.data = response.json()
         except requests.exceptions.ConnectionError:
-            _LOGGER.error("ConnectionError: Is OpenHardwareMonitor running?")
+            _LOGGER.debug("ConnectionError: Is OpenHardwareMonitor running?")
 
     def initialize(self, now):
         """Parse of the sensors and adding of devices."""