diff --git a/resources/strings/strings.xml b/resources/strings/strings.xml
index c03c3ec..052e264 100644
--- a/resources/strings/strings.xml
+++ b/resources/strings/strings.xml
@@ -32,6 +32,7 @@
     <string id="NoJson">No JSON returned from HTTP request.</string>
     <string id="UnhandledHttpErr">HTTP request returned error code = </string>
     <string id="TrailingSlashErr">API URL must not have a trailing slash '/'</string>
+    <string id="WebhookFailed">Failed to register Webhook</string>
     <string id="Available" scope="glance">Available</string>
     <string id="Checking" scope="glance">Checking...</string>
     <string id="Unavailable" scope="glance">Unavailable</string>
diff --git a/source/RezStrings.mc b/source/RezStrings.mc
index 7c0bda4..2344bbd 100644
--- a/source/RezStrings.mc
+++ b/source/RezStrings.mc
@@ -47,6 +47,7 @@ class RezStrings {
     private static var strNoJson            as Lang.String     or Null;
     private static var strUnhandledHttpErr  as Lang.String     or Null;
     private static var strTrailingSlashErr  as Lang.String     or Null;
+    private static var strWebhookFailed     as Lang.String or Null;
     (:glance)
     private static var strAvailable         as Lang.String     or Null;
     (:glance)
@@ -98,6 +99,7 @@ class RezStrings {
         strNoJson            = WatchUi.loadResource($.Rez.Strings.NoJson);
         strUnhandledHttpErr  = WatchUi.loadResource($.Rez.Strings.UnhandledHttpErr);
         strTrailingSlashErr  = WatchUi.loadResource($.Rez.Strings.TrailingSlashErr);
+        strWebhookFailed     = WatchUi.loadResource($.Rez.Strings.WebhookFailed);
         strAvailable         = WatchUi.loadResource($.Rez.Strings.Available);
         strChecking          = WatchUi.loadResource($.Rez.Strings.Checking);
         strUnavailable       = WatchUi.loadResource($.Rez.Strings.Unavailable);
@@ -178,6 +180,10 @@ class RezStrings {
         return strTrailingSlashErr;
     }
 
+    static function getWebhookFailed() as Lang.String {
+        return strWebhookFailed;
+    }
+
     static function getAvailable() as Lang.String {
         return strAvailable;
     }
diff --git a/source/WebhookManager.mc b/source/WebhookManager.mc
index 687f908..ead1da5 100644
--- a/source/WebhookManager.mc
+++ b/source/WebhookManager.mc
@@ -2,38 +2,88 @@ using Toybox.Lang;
 using Toybox.Communications;
 using Toybox.System;
 
+// Can use push view so must never be run in a glance context
 class WebhookManager {
     function onReturnRequestWebhookId(responseCode as Lang.Number, data as Null or Lang.Dictionary or Lang.String) as Void {
-        // TODO: Handle errors
-        if (responseCode == 201) {
-            var id = data.get("webhook_id") as Lang.String or Null;
-            if (id != null) {
-                Settings.setWebhookId(id);
-                registerWebhookSensor({
-                    "device_class"        => "battery",
-                    "name"                => "Battery Level",
-                    "state"               => System.getSystemStats().battery,
-                    "type"                => "sensor",
-                    "unique_id"           => "battery_level",
-                    "unit_of_measurement" => "%",
-                    "state_class"         => "measurement",
-                    "entity_category"     => "diagnostic",
-                    "disabled"            => false
-                });
-                registerWebhookSensor({
-                    "device_class"    => "battery_charging",
-                    "name"            => "Battery is Charging",
-                    "state"           => System.getSystemStats().charging,
-                    "type"            => "binary_sensor",
-                    "unique_id"       => "battery_is_charging",
-                    "entity_category" => "diagnostic",
-                    "disabled"        => false
-                });
-            }
-        } else {
-            if (Globals.scDebug) {
-                System.println("WebhookManager onReturnRequestWebhookId(): Error: " + responseCode);
-            }
+        switch (responseCode) {
+            case Communications.BLE_HOST_TIMEOUT:
+            case Communications.BLE_CONNECTION_UNAVAILABLE:
+                if (Globals.scDebug) {
+                    System.println("WebhookManager onReturnRequestWebhookId() Response Code: BLE_HOST_TIMEOUT or BLE_CONNECTION_UNAVAILABLE, Bluetooth connection severed.");
+                }
+                ErrorView.show(RezStrings.getWebhookFailed()+ "\n" + RezStrings.getNoPhone() + ".");
+                break;
+
+            case Communications.BLE_QUEUE_FULL:
+                if (Globals.scDebug) {
+                    System.println("WebhookManager onReturnRequestWebhookId() Response Code: BLE_QUEUE_FULL, API calls too rapid.");
+                }
+                ErrorView.show(RezStrings.getWebhookFailed()+ "\n" + RezStrings.getApiFlood());
+                break;
+
+            case Communications.NETWORK_REQUEST_TIMED_OUT:
+                if (Globals.scDebug) {
+                    System.println("WebhookManager onReturnRequestWebhookId() Response Code: NETWORK_REQUEST_TIMED_OUT, check Internet connection.");
+                }
+                ErrorView.show(RezStrings.getWebhookFailed()+ "\n" + RezStrings.getNoResponse());
+                break;
+
+            case Communications.NETWORK_RESPONSE_OUT_OF_MEMORY:
+                if (Globals.scDebug) {
+                    System.println("WebhookManager onReturnRequestWebhookId() Response Code: NETWORK_RESPONSE_OUT_OF_MEMORY, are we going too fast?");
+                }
+                // Ignore and see if we can carry on
+                break;
+            case Communications.INVALID_HTTP_BODY_IN_NETWORK_RESPONSE:
+                if (Globals.scDebug) {
+                    System.println("WebhookManager onReturnRequestWebhookId() Response Code: INVALID_HTTP_BODY_IN_NETWORK_RESPONSE, check JSON is returned.");
+                }
+                ErrorView.show(RezStrings.getWebhookFailed()+ "\n" + RezStrings.getNoJson());
+                break;
+
+            case 404:
+                if (Globals.scDebug) {
+                    System.println("WebhookManager onReturnRequestWebhookId() Response Code: 404, page not found. Check API URL setting.");
+                }
+                ErrorView.show(RezStrings.getWebhookFailed()+ "\n" + RezStrings.getApiUrlNotFound());
+                break;
+
+            case 201:
+                var id = data.get("webhook_id") as Lang.String or Null;
+                if (id != null) {
+                    Settings.setWebhookId(id);
+                    registerWebhookSensor({
+                        "device_class"        => "battery",
+                        "name"                => "Battery Level",
+                        "state"               => System.getSystemStats().battery,
+                        "type"                => "sensor",
+                        "unique_id"           => "battery_level",
+                        "unit_of_measurement" => "%",
+                        "state_class"         => "measurement",
+                        "entity_category"     => "diagnostic",
+                        "disabled"            => false
+                    });
+                    registerWebhookSensor({
+                        "device_class"    => "battery_charging",
+                        "name"            => "Battery is Charging",
+                        "state"           => System.getSystemStats().charging,
+                        "type"            => "binary_sensor",
+                        "unique_id"       => "battery_is_charging",
+                        "entity_category" => "diagnostic",
+                        "disabled"        => false
+                    });
+                } else {
+                    if (Globals.scDebug) {
+                        System.println("WebhookManager onReturnRequestWebhookId(): No webhook id in response data.");
+                    }
+                }
+                break;
+
+            default:
+                if (Globals.scDebug) {
+                    System.println("WebhookManager onReturnRequestWebhookId(): Unhandled HTTP response code = " + responseCode);
+                }
+                ErrorView.show(RezStrings.getWebhookFailed()+ "\n" + RezStrings.getUnhandledHttpErr() + responseCode);
         }
     }