diff --git a/x-pack/legacy/plugins/watcher/server/np_ready/models/action_status/__tests__/action_status.js b/x-pack/legacy/plugins/watcher/server/np_ready/models/action_status/__tests__/action_status.js
index 21e27a1b12c460..7b55ff16926033 100644
--- a/x-pack/legacy/plugins/watcher/server/np_ready/models/action_status/__tests__/action_status.js
+++ b/x-pack/legacy/plugins/watcher/server/np_ready/models/action_status/__tests__/action_status.js
@@ -106,11 +106,39 @@ describe('action_status', () => {
         };
       });
 
-      it(`correctly calculates ACTION_STATES.ERROR`, () => {
-        upstreamJson.actionStatusJson.last_execution.successful = false;
-        const actionStatus = ActionStatus.fromUpstreamJson(upstreamJson);
+      describe(`correctly calculates ACTION_STATES.ERROR`, () => {
+        it('lastExecutionSuccessful is equal to false', () => {
+          upstreamJson.actionStatusJson.last_execution.successful = false;
+          const actionStatus = ActionStatus.fromUpstreamJson(upstreamJson);
+          expect(actionStatus.state).to.be(ACTION_STATES.ERROR);
+        });
 
-        expect(actionStatus.state).to.be(ACTION_STATES.ERROR);
+        it('action is acked and lastAcknowledged is less than lastExecution', () => {
+          const actionStatus = ActionStatus.fromUpstreamJson({
+            ...upstreamJson,
+            actionStatusJson: {
+              ack: {
+                state: 'acked',
+                timestamp: '2017-03-01T00:00:00.000Z',
+              },
+              last_execution: {
+                timestamp: '2017-03-02T00:00:00.000Z',
+              },
+            },
+          });
+          expect(actionStatus.state).to.be(ACTION_STATES.ERROR);
+        });
+
+        it('action is ackable and lastSuccessfulExecution is less than lastExecution', () => {
+          delete upstreamJson.actionStatusJson.last_throttle;
+          upstreamJson.actionStatusJson.ack.state = 'ackable';
+          upstreamJson.actionStatusJson.last_successful_execution.timestamp =
+            '2017-03-01T00:00:00.000Z';
+          upstreamJson.actionStatusJson.last_execution.timestamp = '2017-03-02T00:00:00.000Z';
+          const actionStatus = ActionStatus.fromUpstreamJson(upstreamJson);
+
+          expect(actionStatus.state).to.be(ACTION_STATES.ERROR);
+        });
       });
 
       it('correctly calculates ACTION_STATES.CONFIG_ERROR', () => {
@@ -192,18 +220,7 @@ describe('action_status', () => {
         });
       });
 
-      it(`correctly calculates ACTION_STATES.ERROR`, () => {
-        delete upstreamJson.actionStatusJson.last_throttle;
-        upstreamJson.actionStatusJson.ack.state = 'ackable';
-        upstreamJson.actionStatusJson.last_successful_execution.timestamp =
-          '2017-03-01T00:00:00.000Z';
-        upstreamJson.actionStatusJson.last_execution.timestamp = '2017-03-02T00:00:00.000Z';
-        const actionStatus = ActionStatus.fromUpstreamJson(upstreamJson);
-
-        expect(actionStatus.state).to.be(ACTION_STATES.ERROR);
-      });
-
-      it(`throws an error if it can not determine ACTION_STATE`, () => {
+      it(`correctly calculates ACTION_STATES.UNKNOWN if it can not determine state`, () => {
         upstreamJson = {
           id: 'my-action',
           actionStatusJson: {
@@ -213,9 +230,7 @@ describe('action_status', () => {
         };
         const actionStatus = ActionStatus.fromUpstreamJson(upstreamJson);
 
-        expect(() => {
-          actionStatus.state;
-        }).to.throwError(/could not determine action status/i);
+        expect(actionStatus.state).to.be(ACTION_STATES.UNKNOWN);
       });
     });
 
diff --git a/x-pack/plugins/translations/translations/ja-JP.json b/x-pack/plugins/translations/translations/ja-JP.json
index 84020926955906..d785a897093af6 100644
--- a/x-pack/plugins/translations/translations/ja-JP.json
+++ b/x-pack/plugins/translations/translations/ja-JP.json
@@ -12921,7 +12921,6 @@
     "xpack.watcher.deleteSelectedWatchesConfirmModal.deleteButtonLabel": "{numWatchesToDelete, plural, one {ウォッチ} other {# ウォッチ}}を削除 ",
     "xpack.watcher.deleteSelectedWatchesConfirmModal.descriptionText": "{numWatchesToDelete, plural, one {削除されたウォッチ} other {削除されたウォッチ}}は回復できません",
     "xpack.watcher.models.actionStatus.actionStatusJsonPropertyMissingBadRequestMessage": "JSON引数には\"{missingProperty}\"プロパティが含まれている必要があります",
-    "xpack.watcher.models.actionStatus.notDetermineActionStatusBadImplementationMessage": "アクションステータスを把握できませんでした; action = {actionStatusJson}",
     "xpack.watcher.models.baseAction.selectMessageText": "アクションを実行します。",
     "xpack.watcher.models.baseAction.simulateButtonLabel": "今すぐこのアクションをシミュレート",
     "xpack.watcher.models.baseAction.simulateMessage": "アクション {id} のシミュレーションが完了しました",
@@ -13243,4 +13242,4 @@
     "xpack.watcher.watchEdit.thresholdWatchExpression.aggType.fieldIsRequiredValidationMessage": "フィールドを選択してください。",
     "xpack.watcher.watcherDescription": "アラートの作成、管理、監視によりデータへの変更を検知します。"
   }
-}
+}
\ No newline at end of file
diff --git a/x-pack/plugins/translations/translations/zh-CN.json b/x-pack/plugins/translations/translations/zh-CN.json
index f3af5ec10338cd..4e422e9aea7d9f 100644
--- a/x-pack/plugins/translations/translations/zh-CN.json
+++ b/x-pack/plugins/translations/translations/zh-CN.json
@@ -12920,7 +12920,6 @@
     "xpack.watcher.deleteSelectedWatchesConfirmModal.deleteButtonLabel": "删除 {numWatchesToDelete, plural, one {个监视} other {# 个监视}} ",
     "xpack.watcher.deleteSelectedWatchesConfirmModal.descriptionText": "无法恢复{numWatchesToDelete, plural, one {已删除监视} other {已删除监视}}。",
     "xpack.watcher.models.actionStatus.actionStatusJsonPropertyMissingBadRequestMessage": "JSON 参数必须包含“{missingProperty}”属性",
-    "xpack.watcher.models.actionStatus.notDetermineActionStatusBadImplementationMessage": "无法确定操作状态；操作 = {actionStatusJson}",
     "xpack.watcher.models.baseAction.selectMessageText": "执行操作。",
     "xpack.watcher.models.baseAction.simulateButtonLabel": "立即模拟此操作",
     "xpack.watcher.models.baseAction.simulateMessage": "已成功模拟操作 {id}",
@@ -13242,4 +13241,4 @@
     "xpack.watcher.watchEdit.thresholdWatchExpression.aggType.fieldIsRequiredValidationMessage": "此字段必填。",
     "xpack.watcher.watcherDescription": "通过创建、管理和监测警报来检测数据中的更改。"
   }
-}
+}
\ No newline at end of file