diff --git a/homeassistant/components/vicare/climate.py b/homeassistant/components/vicare/climate.py
index fe162c0c837..7e330383b30 100644
--- a/homeassistant/components/vicare/climate.py
+++ b/homeassistant/components/vicare/climate.py
@@ -1,5 +1,7 @@
 """Viessmann ViCare climate device."""
 import logging
+import requests
+import simplejson
 
 from homeassistant.components.climate import ClimateDevice
 from homeassistant.components.climate.const import (
@@ -111,55 +113,64 @@ class ViCareClimate(ClimateDevice):
 
     def update(self):
         """Let HA know there has been an update from the ViCare API."""
-        _room_temperature = self._api.getRoomTemperature()
-        _supply_temperature = self._api.getSupplyTemperature()
-        if _room_temperature is not None and _room_temperature != PYVICARE_ERROR:
-            self._current_temperature = _room_temperature
-        elif _supply_temperature != PYVICARE_ERROR:
-            self._current_temperature = _supply_temperature
-        else:
-            self._current_temperature = None
-        self._current_program = self._api.getActiveProgram()
+        try:
+            _room_temperature = self._api.getRoomTemperature()
+            _supply_temperature = self._api.getSupplyTemperature()
+            if _room_temperature is not None and _room_temperature != PYVICARE_ERROR:
+                self._current_temperature = _room_temperature
+            elif _supply_temperature != PYVICARE_ERROR:
+                self._current_temperature = _supply_temperature
+            else:
+                self._current_temperature = None
+            self._current_program = self._api.getActiveProgram()
 
-        # The getCurrentDesiredTemperature call can yield 'error' (str) when the system is in standby
-        desired_temperature = self._api.getCurrentDesiredTemperature()
-        if desired_temperature == PYVICARE_ERROR:
-            desired_temperature = None
+            # The getCurrentDesiredTemperature call can yield 'error' (str) when the system is in standby
+            desired_temperature = self._api.getCurrentDesiredTemperature()
+            if desired_temperature == PYVICARE_ERROR:
+                desired_temperature = None
 
-        self._target_temperature = desired_temperature
+            self._target_temperature = desired_temperature
 
-        self._current_mode = self._api.getActiveMode()
+            self._current_mode = self._api.getActiveMode()
 
-        # Update the generic device attributes
-        self._attributes = {}
-        self._attributes["room_temperature"] = _room_temperature
-        self._attributes["supply_temperature"] = _supply_temperature
-        self._attributes["outside_temperature"] = self._api.getOutsideTemperature()
-        self._attributes["active_vicare_program"] = self._current_program
-        self._attributes["active_vicare_mode"] = self._current_mode
-        self._attributes["heating_curve_slope"] = self._api.getHeatingCurveSlope()
-        self._attributes["heating_curve_shift"] = self._api.getHeatingCurveShift()
-        self._attributes[
-            "month_since_last_service"
-        ] = self._api.getMonthSinceLastService()
-        self._attributes["date_last_service"] = self._api.getLastServiceDate()
-        self._attributes["error_history"] = self._api.getErrorHistory()
-        self._attributes["active_error"] = self._api.getActiveError()
-        self._attributes[
-            "circulationpump_active"
-        ] = self._api.getCirculationPumpActive()
+            # Update the generic device attributes
+            self._attributes = {}
+            self._attributes["room_temperature"] = _room_temperature
+            self._attributes["supply_temperature"] = _supply_temperature
+            self._attributes["outside_temperature"] = self._api.getOutsideTemperature()
+            self._attributes["active_vicare_program"] = self._current_program
+            self._attributes["active_vicare_mode"] = self._current_mode
+            self._attributes["heating_curve_slope"] = self._api.getHeatingCurveSlope()
+            self._attributes["heating_curve_shift"] = self._api.getHeatingCurveShift()
+            self._attributes[
+                "month_since_last_service"
+            ] = self._api.getMonthSinceLastService()
+            self._attributes["date_last_service"] = self._api.getLastServiceDate()
+            self._attributes["error_history"] = self._api.getErrorHistory()
+            self._attributes["active_error"] = self._api.getActiveError()
+            self._attributes[
+                "circulationpump_active"
+            ] = self._api.getCirculationPumpActive()
 
-        # Update the specific device attributes
-        if self._heating_type == HeatingType.gas:
-            self._current_action = self._api.getBurnerActive()
+            # Update the specific device attributes
+            if self._heating_type == HeatingType.gas:
+                self._current_action = self._api.getBurnerActive()
 
-            self._attributes["burner_modulation"] = self._api.getBurnerModulation()
-            self._attributes["boiler_temperature"] = self._api.getBoilerTemperature()
+                self._attributes["burner_modulation"] = self._api.getBurnerModulation()
+                self._attributes[
+                    "boiler_temperature"
+                ] = self._api.getBoilerTemperature()
 
-        elif self._heating_type == HeatingType.heatpump:
-            self._current_action = self._api.getCompressorActive()
+            elif self._heating_type == HeatingType.heatpump:
+                self._current_action = self._api.getCompressorActive()
 
-            self._attributes["return_temperature"] = self._api.getReturnTemperature()
+                self._attributes[
+                    "return_temperature"
+                ] = self._api.getReturnTemperature()
+        except requests.exceptions.ConnectionError:
+            _LOGGER.error("Unable to retrieve data from ViCare server")
+        except simplejson.errors.JSONDecodeError:
+            _LOGGER.error("Unable to decode data from ViCare server")
 
     @property
     def supported_features(self):
diff --git a/homeassistant/components/vicare/water_heater.py b/homeassistant/components/vicare/water_heater.py
index 7c4968ad0a4..1f56c46dc1c 100644
--- a/homeassistant/components/vicare/water_heater.py
+++ b/homeassistant/components/vicare/water_heater.py
@@ -1,5 +1,7 @@
 """Viessmann ViCare water_heater device."""
 import logging
+import requests
+import simplejson
 
 from homeassistant.components.water_heater import (
     SUPPORT_TARGET_TEMPERATURE,
@@ -41,6 +43,8 @@ HA_TO_VICARE_HVAC_DHW = {
     OPERATION_MODE_ON: VICARE_MODE_DHW,
 }
 
+PYVICARE_ERROR = "error"
+
 
 def setup_platform(hass, config, add_entities, discovery_info=None):
     """Create the ViCare water_heater devices."""
@@ -75,15 +79,22 @@ class ViCareWater(WaterHeaterDevice):
 
     def update(self):
         """Let HA know there has been an update from the ViCare API."""
-        current_temperature = self._api.getDomesticHotWaterStorageTemperature()
-        if current_temperature is not None and current_temperature != "error":
-            self._current_temperature = current_temperature
-        else:
-            self._current_temperature = None
+        try:
+            current_temperature = self._api.getDomesticHotWaterStorageTemperature()
+            if current_temperature != PYVICARE_ERROR:
+                self._current_temperature = current_temperature
+            else:
+                self._current_temperature = None
 
-        self._target_temperature = self._api.getDomesticHotWaterConfiguredTemperature()
+            self._target_temperature = (
+                self._api.getDomesticHotWaterConfiguredTemperature()
+            )
 
-        self._current_mode = self._api.getActiveMode()
+            self._current_mode = self._api.getActiveMode()
+        except requests.exceptions.ConnectionError:
+            _LOGGER.error("Unable to retrieve data from ViCare server")
+        except simplejson.errors.JSONDecodeError:
+            _LOGGER.error("Unable to decode data from ViCare server")
 
     @property
     def supported_features(self):