diff --git a/app/common/services/api-utils.js b/app/common/services/api-utils.js
index 1e28127..25cbec9 100644
--- a/app/common/services/api-utils.js
+++ b/app/common/services/api-utils.js
@@ -33,10 +33,11 @@
               LED_STATE: Constants.LED_STATE,
               LED_STATE_TEXT: Constants.LED_STATE_TEXT,
               HOST_SESSION_STORAGE_KEY: Constants.API_CREDENTIALS.host_storage_key,
-              getChassisState: function(callback){
+              getChassisState: function(){
+                var deferred = $q.defer();
                 $http({
                   method: 'GET',
-                  url: DataService.getHost() + "/xyz/openbmc_project/state/chassis0",
+                  url: DataService.getHost() + "/xyz/openbmc_project/state/chassis0/attr/CurrentPowerState",
                   headers: {
                       'Accept': 'application/json',
                       'Content-Type': 'application/json'
@@ -45,15 +46,18 @@
                 }).then(function(response){
                       var json = JSON.stringify(response.data);
                       var content = JSON.parse(json);
-                      callback(content.data.CurrentPowerState);
+                      deferred.resolve(content.data);
                 }, function(error){
                   console.log(error);
+                  deferred.reject(error);
                 });
+                return deferred.promise;
               },
-              getHostState: function(callback){
+              getHostState: function(){
+                var deferred = $q.defer();
                 $http({
                   method: 'GET',
-                  url: DataService.getHost() + "/xyz/openbmc_project/state/host0",
+                  url: DataService.getHost() + "/xyz/openbmc_project/state/host0/attr/CurrentHostState",
                   headers: {
                       'Accept': 'application/json',
                       'Content-Type': 'application/json'
@@ -62,10 +66,12 @@
                 }).then(function(response){
                       var json = JSON.stringify(response.data);
                       var content = JSON.parse(json);
-                      callback(content.data.CurrentHostState);
+                      deferred.resolve(content.data);
                 }, function(error){
                   console.log(error);
+                  deferred.reject(error);
                 });
+                return deferred.promise;
               },
               getNetworkInfo: function(){
                 var deferred = $q.defer();
@@ -287,7 +293,8 @@
                   }
                 });
               },
-              chassisPowerOff: function(callback){
+              chassisPowerOff: function(){
+                var deferred = $q.defer();
                 $http({
                   method: 'PUT',
                   url: DataService.getHost() + "/xyz/openbmc_project/state/chassis0/attr/RequestedPowerTransition",
@@ -300,16 +307,12 @@
                 }).then(function(response){
                       var json = JSON.stringify(response.data);
                       var content = JSON.parse(json);
-                      if(callback){
-                          return callback(content.status);
-                      }
+                      deferred.resolve(content.status);
                 }, function(error){
-                  if(callback){
-                      callback(error);
-                  }else{
-                      console.log(error);
-                  }
+                  console.log(error);
+                  deferred.reject(error);
                 });
+                return deferred.promise;
               },
               setLEDState: function(state, callback){
                 $http({
@@ -359,7 +362,8 @@
                   }
                 });
               },
-              hostPowerOn: function(callback){
+              hostPowerOn: function(){
+                var deferred = $q.defer();
                 $http({
                   method: 'PUT',
                   url: DataService.getHost() + "/xyz/openbmc_project/state/host0/attr/RequestedHostTransition",
@@ -372,18 +376,15 @@
                 }).then(function(response){
                       var json = JSON.stringify(response.data);
                       var content = JSON.parse(json);
-                      if(callback){
-                          return callback(content.status);
-                      }
+                      deferred.resolve(content.status);
                 }, function(error){
-                  if(callback){
-                      callback(error);
-                  }else{
-                      console.log(error);
-                  }
+                  console.log(error);
+                  deferred.reject(error);
                 });
+                return deferred.promise;
               },
-              hostPowerOff: function(callback){
+              hostPowerOff: function(){
+                var deferred = $q.defer();
                 $http({
                   method: 'PUT',
                   url: DataService.getHost() + "/xyz/openbmc_project/state/host0/attr/RequestedHostTransition",
@@ -396,18 +397,15 @@
                 }).then(function(response){
                       var json = JSON.stringify(response.data);
                       var content = JSON.parse(json);
-                      if(callback){
-                          return callback(content.status);
-                      }
+                      deferred.resolve(content.status);
                 }, function(error){
-                  if(callback){
-                      callback(error);
-                  }else{
-                      console.log(error);
-                  }
+                  console.log(error);
+                  deferred.reject(error);
                 });
+                return deferred.promise;
               },
-              hostReboot: function(callback){
+              hostReboot: function(){
+                var deferred = $q.defer();
                 $http({
                   method: 'PUT',
                   url: DataService.getHost() + "/xyz/openbmc_project/state/host0/attr/RequestedHostTransition",
@@ -420,16 +418,13 @@
                 }).then(function(response){
                       var json = JSON.stringify(response.data);
                       var content = JSON.parse(json);
-                      if(callback){
-                          return callback(content.status);
-                      }
+                      deferred.resolve(content.status);
                 }, function(error){
-                  if(callback){
-                      callback(error);
-                  }else{
-                      console.log(error);
-                  }
+                  console.log(error);
+                  deferred.reject(error);
                 });
+
+                return deferred.promise;
               },
               hostShutdown: function(callback){
                 $http({
diff --git a/app/common/services/constants.js b/app/common/services/constants.js
index 0bb2123..21241da 100644
--- a/app/common/services/constants.js
+++ b/app/common/services/constants.js
@@ -27,11 +27,15 @@
                 },
                 CHASSIS_POWER_STATE: {
                     on: 'On',
-                    off: 'Off'
+                    on_code: 'xyz.openbmc_project.State.Chassis.PowerState.On',
+                    off: 'Off',
+                    off_code: 'xyz.openbmc_project.State.Chassis.PowerState.Off'
                 },
                 HOST_STATE_TEXT: {
                     on: 'Running',
+                    on_code: 'xyz.openbmc_project.State.Host.HostState.Running',
                     off: 'Off',
+                    off_code: 'xyz.openbmc_project.State.Host.HostState.Off',
                     booting: 'Quiesced',
                     unreachable: 'Unreachable'
                 },
@@ -107,21 +111,31 @@
                 ],
                 SENSOR_SORT_ORDER_DEFAULT: 8,
                 FIRMWARE: {
-                  ACTIVATE_FIRMWARE: 'xyz.openbmc_project.Software.Activation.RequestedActivations.Active',
-                  FUNCTIONAL_OBJPATH: '/xyz/openbmc_project/software/functional'
+                    ACTIVATE_FIRMWARE: 'xyz.openbmc_project.Software.Activation.RequestedActivations.Active',
+                    FUNCTIONAL_OBJPATH: '/xyz/openbmc_project/software/functional'
                 },
-               POLL_INTERVALS: {
-                  ACTIVATION: 5000
+                POLL_INTERVALS: {
+                    ACTIVATION: 5000,
+                    POWER_OP: 5000,
                 },
-               TIMEOUT: {
-                  ACTIVATION: 1000 * 60 * 10, // 10 mins
+                TIMEOUT: {
+                    ACTIVATION: 1000 * 60 * 10, // 10 mins
+                    CHASSIS_OFF: 1000 * 60 * 5, // 5 mins
+                    HOST_ON: 1000 * 60 * 5, // 5 mins
                 },
                 MESSAGES: {
-                  SENSOR: {
-                    NO_SENSOR_DATA: 'There are no sensors found.',
-                    CRITICAL_NO_SENSOR_DATA: 'There are no sensors in Critical state.',
-                    WARNING_NO_SENSOR_DATA: 'There are no sensors in Warning state.'
-                  }
+                    POLL: {
+                        TIMEOUT: 'Time out. Did not reach power state in allotted time.',
+                    },
+                    SENSOR: {
+                        NO_SENSOR_DATA: 'There are no sensors found.',
+                        CRITICAL_NO_SENSOR_DATA: 'There are no sensors in Critical state.',
+                        WARNING_NO_SENSOR_DATA: 'There are no sensors in Warning state.'
+                    },
+                    ERROR_MODAL: {
+                        TITLE: 'Unexpected error',
+                        DESCRIPTION: 'Oops! An unexpected error occurred. Record specific details of the issue, then contact your company support services.'
+                    }
                 },
                 POWER_CAP_TEXT: {
                     unit: 'W',
diff --git a/app/common/services/dataService.js b/app/common/services/dataService.js
index 201e79c..d84821a 100644
--- a/app/common/services/dataService.js
+++ b/app/common/services/dataService.js
@@ -33,6 +33,10 @@
             this.hostname = "";
             this.mac_address = "";
             this.remote_window_active = false;
+
+            this.displayErrorModal = false;
+            this.errorModalDetails = {};
+
             this.ignoreHttpError = false;
             this.getServerId = function(){
                  return this.host.replace(/^https?\:\/\//ig,"");
@@ -121,6 +125,25 @@
 
                 this.server_health = Constants.SERVER_HEALTH.good;
             }
+
+            this.activateErrorModal = function(data){
+                if(data && data.hasOwnProperty('title')){
+                    this.errorModalDetails.title = data.title;
+                }else{
+                    this.errorModalDetails.title = Constants.MESSAGES.ERROR_MODAL.TITLE;
+                }
+
+                if(data && data.hasOwnProperty('description')){
+                    this.errorModalDetails.description = data.description;
+                }else{
+                    this.errorModalDetails.description = Constants.MESSAGES.ERROR_MODAL.DESCRIPTION;
+                }
+                this.displayErrorModal = true;
+            }
+
+            this.deactivateErrorModal = function(){
+                this.displayErrorModal = false;
+            }
         }]);
 
 })(window.angular);