diff --git a/loopback/locale/es.json b/loopback/locale/es.json
index 932dfe98f..41dfff73a 100644
--- a/loopback/locale/es.json
+++ b/loopback/locale/es.json
@@ -247,7 +247,10 @@
 	"Empty data source": "Origen de datos vacio",
 	"Email verify": "Correo de verificación",
 	"Landing cannot be lesser than shipment": "Landing cannot be lesser than shipment",
-    "Receipt's bank was not found": "No se encontró el banco del recibo",
-    "This receipt was not compensated": "Este recibo no ha sido compensado",
-    "Client's email was not found": "No se encontró el email del cliente"
+	"Receipt's bank was not found": "No se encontró el banco del recibo",
+	"This receipt was not compensated": "Este recibo no ha sido compensado",
+	"Client's email was not found": "No se encontró el email del cliente",
+	"This worker code already exists": "Este codigo de trabajador ya existe",
+	"This personal mail already exists": "Este correo personal ya existe",
+	"This worker already exists": "Este trabajador ya existe"
 }
diff --git a/modules/worker/back/methods/worker/new.js b/modules/worker/back/methods/worker/new.js
index 97fdc1033..07a091693 100644
--- a/modules/worker/back/methods/worker/new.js
+++ b/modules/worker/back/methods/worker/new.js
@@ -1,4 +1,5 @@
 const md5 = require('md5');
+const UserError = require('vn-loopback/util/user-error');
 
 module.exports = Self => {
     Self.remoteMethodCtx('new', {
@@ -8,103 +9,103 @@ module.exports = Self => {
             {
                 arg: 'fi',
                 type: 'string',
-                description: `The fi of worker`,
+                description: `The worker fi`,
                 required: true,
             },
             {
                 arg: 'name',
                 type: 'string',
-                description: `REPLACE!`,
+                description: `The user name`,
                 required: true,
             },
             {
                 arg: 'firstName',
                 type: 'string',
-                description: `REPLACE!`,
+                description: `The worker firstname`,
                 required: true,
             },
             {
                 arg: 'lastNames',
                 type: 'string',
-                description: `REPLACE!`,
+                description: `The worker lastnames`,
                 required: true,
             },
             {
                 arg: 'email',
                 type: 'string',
-                description: `REPLACE!`,
+                description: `The worker email`,
                 required: true,
             },
             {
                 arg: 'roleFk',
                 type: 'number',
-                description: `REPLACE!`,
+                description: `The worker role`,
                 required: true,
             },
             {
                 arg: 'street',
                 type: 'string',
-                description: `REPLACE!`,
+                description: `The worker address`,
                 required: true,
             },
             {
                 arg: 'city',
                 type: 'string',
-                description: `REPLACE!`,
+                description: `The worker city`,
                 required: true,
             },
             {
                 arg: 'provinceFk',
                 type: 'number',
-                description: `REPLACE!`,
+                description: `The worker province`,
                 required: true,
             },
             {
                 arg: 'iban',
                 type: 'string',
-                description: `REPLACE!`,
+                description: `The worker iban`,
                 required: true,
             },
             {
                 arg: 'bankEntityFk',
                 type: 'number',
-                description: `REPLACE!`,
+                description: `The worker bank entity`,
                 required: true,
             },
             {
                 arg: 'companyFk',
                 type: 'number',
-                description: `REPLACE!`,
+                description: `The worker company`,
                 required: true,
             },
             {
                 arg: 'postcode',
                 type: 'string',
-                description: `REPLACE!`,
+                description: `The worker postcode`,
                 required: true,
             },
             {
                 arg: 'phone',
                 type: 'string',
-                description: `REPLACE!`,
+                description: `The worker phone`,
                 required: true,
             },
             {
                 arg: 'code',
                 type: 'string',
-                description: `REPLACE!`,
+                description: `The worker code`,
                 required: true,
             },
             {
                 arg: 'bossFk',
                 type: 'number',
-                description: `REPLACE!`,
+                description: `The worker boss`,
                 required: true,
             },
             {
                 arg: 'birth',
                 type: 'date',
-                description: `REPLACE!`,
+                description: `The worker birth`,
                 required: true,
             },
         ],
@@ -152,7 +153,7 @@ module.exports = Self => {
                         nickname,
                         password: md5(randomPassword),
                         email: args.email,
-                        role: args.role,
+                        role: args.roleFk,
                     },
                     myOptions
                 );
@@ -222,10 +223,21 @@ module.exports = Self => {
             );
 
             if (tx) await tx.commit();
-        } catch (e) {
+        } catch (err) {
             if (tx) await tx.rollback();
-            console.log(e);
-            throw e;
+            const code = err.code;
+            const message = err.sqlMessage;
+
+            if (code === 'ER_DUP_ENTRY' && message.includes(`for key 'mail'`))
+                throw new UserError(`This personal mail already exists`);
+
+            if (code === 'ER_DUP_ENTRY' && message.includes(`CodigoTrabajador_UNIQUE`))
+                throw new UserError(`This worker code already exists`);
+
+            if (code === 'ER_DUP_ENTRY' && message.includes(`PRIMARY`))
+                throw new UserError(`This worker already exists`);
+
+            throw err;
         }
 
         await models.user.resetPassword({
diff --git a/modules/worker/front/create/index.html b/modules/worker/front/create/index.html
index 58b4da060..a86a4e899 100644
--- a/modules/worker/front/create/index.html
+++ b/modules/worker/front/create/index.html
@@ -13,11 +13,13 @@
                 label="Firstname"
                 ng-model="$ctrl.worker.firstName"
                 rule
+                on-change="$ctrl.generateCodeUser()"
                 vn-focus>
             </vn-textfield>
             <vn-textfield
                 vn-one
                 label="Lastname"
+                on-change="$ctrl.generateCodeUser()"
                 ng-model="$ctrl.worker.lastNames"
                 rule>
             </vn-textfield>
@@ -38,6 +40,8 @@
                 vn-one
                 label="Code"
                 ng-model="$ctrl.worker.code"
+                maxLength="3"
+                on-change="$ctrl.worker.code = $ctrl.worker.code.toUpperCase()"
                 rule>
             </vn-textfield>
             <vn-textfield
@@ -107,15 +111,14 @@
         </vn-horizontal>
         <vn-horizontal>
             <vn-textfield
-                label="User"
+                label="Web user"
                 ng-model="$ctrl.worker.name"
                 rule>
             </vn-textfield>
             <vn-textfield
                 label="Personal email"
                 ng-model="$ctrl.worker.email"
-                rule
-                info="You can save multiple emails">
+                rule>
             </vn-textfield>
             <vn-autocomplete
                 label="Access permission"
diff --git a/modules/worker/front/create/index.js b/modules/worker/front/create/index.js
index fdc02361d..3314a4b10 100644
--- a/modules/worker/front/create/index.js
+++ b/modules/worker/front/create/index.js
@@ -33,6 +33,20 @@ export default class Controller extends Section {
         });
     }
 
+    generateCodeUser() {
+        if (!this.worker.firstName || !this.worker.lastNames) return;
+
+        const totalName = this.worker.firstName.concat(' ' + this.worker.lastNames).toLowerCase();
+        const totalNameArray = totalName.split(' ');
+        let newCode = '';
+
+        for (let part of totalNameArray)
+            newCode += part.charAt(0);
+
+        this.worker.code = newCode.toUpperCase().slice(0, 3);
+        this.worker.name = totalNameArray[0] + newCode.slice(1);
+    }
+
     get province() {
         return this._province;
     }
diff --git a/modules/worker/front/create/locale/es.yml b/modules/worker/front/create/locale/es.yml
index afe3feaa6..8c79d770c 100644
--- a/modules/worker/front/create/locale/es.yml
+++ b/modules/worker/front/create/locale/es.yml
@@ -1,12 +1,12 @@
-Name: Nombre
-Tax number: NIF/CIF
-Business name: Razón social
+Firstname: Nombre
+Lastname: Apellidos
+Fi: DNI/NIF/NIE
+Birth: Fecha de nacimiento
+Code: Código de trabajador
+Province: Provincia
+City: Población
+ProfileType: Tipo de perfil
+Street: Dirección
+Postcode: Código postal
 Web user: Usuario Web
-Email: E-mail
-Create and edit: Crear y editar
-You can save multiple emails: >-
-    Puede guardar varios correos electrónicos encadenándolos mediante comas
-    sin espacios, ejemplo: user@dominio.com, user2@dominio.com siendo el primer
-    correo electrónico el principal
-The type of business must be filled in basic data: El tipo de negocio debe estar rellenado en datos básicos
 Access permission: Permiso de acceso