diff --git a/nodes/core/core/20-inject.html b/nodes/core/core/20-inject.html
index 45488d254..9273cceae 100644
--- a/nodes/core/core/20-inject.html
+++ b/nodes/core/core/20-inject.html
@@ -181,7 +181,7 @@ If you want every 20 minutes from now - use the <i>"interval"</i> option.</p>
             topic: {value:""},
             payload: {value:"", validate: RED.validators.typedInput("payloadType")},
             payloadType: {value:"date"},
-            repeat: {value:""},
+            repeat: {value:"", validate:function(v) { return ((v === "") || (RED.validators.number(v) && (v >= 0))) }},
             crontab: {value:""},
             once: {value:false}
         },
diff --git a/nodes/core/core/80-function.html b/nodes/core/core/80-function.html
index f9fbfc4a7..b64df3dce 100644
--- a/nodes/core/core/80-function.html
+++ b/nodes/core/core/80-function.html
@@ -73,7 +73,13 @@
         oneditprepare: function() {
             var that = this;
             $( "#node-input-outputs" ).spinner({
-                min:1
+                min:1,
+                change: function(event, ui) {
+                    var value = this.value;
+                    if (!value.match(/^\d+$/)) { value = 1;  }
+                    else if (value < this.min) { value = this.min; }
+                    if (value !== this.value) { $(this).spinner("value", value); }
+                }
             });
 
             this.editor = RED.editor.createEditor({
diff --git a/nodes/core/core/89-delay.html b/nodes/core/core/89-delay.html
index b7d2d8c6f..d6ed0dfa2 100644
--- a/nodes/core/core/89-delay.html
+++ b/nodes/core/core/89-delay.html
@@ -129,13 +129,13 @@
         defaults: {
             name: {value:""},
             pauseType: {value:"delay", required:true},
-            timeout: {value:"5", required:true, validate:RED.validators.number()},
+            timeout: {value:"5", required:true, validate:function(v) { return RED.validators.number(v) && (v >= 0); }},
             timeoutUnits: {value:"seconds"},
-            rate: {value:"1", required:true, validate:RED.validators.number()},
+            rate: {value:"1", required:true, validate:function(v) { return RED.validators.number(v) && (v >= 0); }},
             nbRateUnits: {value:"1", required:false, validate:RED.validators.regex(/\d+|/)},
             rateUnits: {value: "second"},
-            randomFirst: {value:"1", required:true, validate:RED.validators.number()},
-            randomLast: {value:"5", required:true, validate:RED.validators.number()},
+            randomFirst: {value:"1", required:true, validate:function(v) { return RED.validators.number(v) && (v >= 0); }},
+            randomLast: {value:"5", required:true, validate:function(v) { return RED.validators.number(v) && (v >= 0); }},
             randomUnits: {value: "seconds"},
             drop: {value:false}
         },