diff --git a/lib/core/i18n/en.json b/lib/core/i18n/en.json
index 91833526ce..8ef8e7a3ca 100644
--- a/lib/core/i18n/en.json
+++ b/lib/core/i18n/en.json
@@ -298,7 +298,7 @@
       "OF": "of"
     },
     "LOADING": "Loading",
-    "UNKNOWN_FORMAT": "Couldn't load preview",
+    "UNKNOWN_FORMAT": "Couldn't load preview. Unknown format.",
     "SIDEBAR": {
       "THUMBNAILS": {
         "PAGE": "Page {{ pageNum }}"
diff --git a/lib/core/viewer/components/unknown-format/unknown-format.component.html b/lib/core/viewer/components/unknown-format/unknown-format.component.html
index 7488627192..2e09cb1bf8 100644
--- a/lib/core/viewer/components/unknown-format/unknown-format.component.html
+++ b/lib/core/viewer/components/unknown-format/unknown-format.component.html
@@ -1,6 +1,6 @@
 <div class="adf-viewer__unknown-format-view">
     <div>
-        <mat-icon class="icon">wifi_tethering</mat-icon>
+        <mat-icon class="icon">error</mat-icon>
         <div class="label">{{ 'ADF_VIEWER.UNKNOWN_FORMAT' | translate }}</div>
     </div>
 </div>
diff --git a/lib/core/viewer/components/viewer.component.ts b/lib/core/viewer/components/viewer.component.ts
index 573f798d88..fbd9163775 100644
--- a/lib/core/viewer/components/viewer.component.ts
+++ b/lib/core/viewer/components/viewer.component.ts
@@ -200,6 +200,8 @@ export class ViewerComponent implements OnChanges, OnInit, OnDestroy {
     @Output()
     invalidSharedLink = new EventEmitter();
 
+    TRY_TIMEOUT: number = 2000;
+
     viewerType = 'unknown';
     isLoading = false;
     nodeEntry: NodeEntry;
@@ -692,8 +694,12 @@ export class ViewerComponent implements OnChanges, OnInit, OnDestroy {
                         this.viewerType = 'error_in_creation';
                         return reject();
                     });
+                } else {
+                    this.isLoading = false;
+                    this.viewerType = 'error_in_creation';
+                    clearInterval(intervalId);
                 }
-            }, 1000);
+            }, this.TRY_TIMEOUT);
         });
     }