diff --git a/Waterboiler/visb_wasserkocher.json b/Waterboiler/visb_wasserkocher.json
index f27daa777960d08068090577fed85589e01a17c7..4544bc2c76cc625f64620554f5491a075fb1c09c 100644
--- a/Waterboiler/visb_wasserkocher.json
+++ b/Waterboiler/visb_wasserkocher.json
@@ -26,6 +26,11 @@
       "id": "turn_off",
       "attr": "visibility",
       "value": "IF an=TRUE THEN \"visible\" ELSE \"hidden\" END"
+    },
+    {
+      "id": "error",
+      "attr": "visibility",
+      "value": "IF deckel_zu=FALSE & an=TRUE THEN \"visible\" ELSE \"hidden\" END"
     }
   ],
   "events": [
diff --git a/Waterboiler/waterheater.svg b/Waterboiler/waterheater.svg
index 2a8361c2d17f969c572591596ff94c48991c7d96..4c7640258bc6c899607742c26748a7dc81151bf6 100644
--- a/Waterboiler/waterheater.svg
+++ b/Waterboiler/waterheater.svg
@@ -646,5 +646,8 @@ OdIkkqyRyhP9Kebkz7cuZy89n+bC9v3PHaML9v6SdzbGmjs7pYf7T6ccU196dZgv04OR/ow+KM8e
 6fhwwpjXc5O3EgGAAwAGAAwAGAAwAGAAwAGAAwAGAAwAGAAwAGAAwAGAD//Z
 " />
    
+    
+    <ellipse id="error" cx="117" cy="202" ry="12" rx="34" opacity = "0.5"
+    stroke="none" stroke-width="3" fill="red" />
 
 </svg>