diff --git a/app/scripts/modules/amazon/src/loadBalancer/configure/application/TargetGroups.tsx b/app/scripts/modules/amazon/src/loadBalancer/configure/application/TargetGroups.tsx
index e4a3d455f1e..791114800c4 100644
--- a/app/scripts/modules/amazon/src/loadBalancer/configure/application/TargetGroups.tsx
+++ b/app/scripts/modules/amazon/src/loadBalancer/configure/application/TargetGroups.tsx
@@ -10,6 +10,8 @@ import {
   SpInput,
   ValidationMessage,
   spelNumberCheck,
+  Validators,
+  robotToHuman,
 } from '@spinnaker/core';
 
 import { IAmazonApplicationLoadBalancer, IAmazonApplicationLoadBalancerUpsertCommand } from 'amazon/domain';
@@ -42,6 +44,15 @@ export class TargetGroups extends React.Component<ITargetGroupsProps, ITargetGro
     };
   }
 
+  private checkBetween(errors: any, object: any, fieldName: string, min: number, max: number) {
+    const field = object[fieldName];
+    if (!Number.isNaN(field)) {
+      errors[fieldName] =
+        Validators.minValue(min)(field, robotToHuman(fieldName)) ||
+        Validators.maxValue(max)(field, robotToHuman(fieldName));
+    }
+  }
+
   public validate(
     values: IAmazonApplicationLoadBalancerUpsertCommand,
   ): FormikErrors<IAmazonApplicationLoadBalancerUpsertCommand> {
@@ -79,6 +90,11 @@ export class TargetGroups extends React.Component<ITargetGroupsProps, ITargetGro
         }
       });
 
+      this.checkBetween(tgErrors, targetGroup, 'healthCheckTimeout', 2, 60);
+      this.checkBetween(tgErrors, targetGroup, 'healthCheckInterval', 5, 300);
+      this.checkBetween(tgErrors, targetGroup, 'healthyThreshold', 2, 10);
+      this.checkBetween(tgErrors, targetGroup, 'unhealthyThreshold', 2, 10);
+
       if (targetGroup.healthCheckPort !== 'traffic-port') {
         const err = spelNumberCheck(targetGroup.healthCheckPort);
         if (err) {
diff --git a/app/scripts/modules/core/src/presentation/FormElements.tsx b/app/scripts/modules/core/src/presentation/FormElements.tsx
index d0b161a1814..74007d355c0 100644
--- a/app/scripts/modules/core/src/presentation/FormElements.tsx
+++ b/app/scripts/modules/core/src/presentation/FormElements.tsx
@@ -10,7 +10,7 @@ export const SpInput = (
 ) => {
   const { error, ...inputProps } = props;
   if (error) {
-    inputProps.className = inputProps.className ? `${inputProps.className} ` : 'invalid';
+    inputProps.className = `${inputProps.className || ''} invalid`;
   }
   inputProps.type = inputProps.type || 'text';
   return (