---
title: "DWT Fernox App Guide"
description: "After downloading the App and completing registration, you can start adding a ‘New Diagnostic Water Test’."
url: https://help.fernox.app/en/articles/125-dwt-fernox-app-guide
collection: "Diagnostic Water Test"
updated: 2026-10-02
language: en
alternates: [es, de, pl, cs, nl-be, fr-be, fr, nl, ro, sk, tr, sv]
---

# DWT Fernox App Guide

After downloading the App and completing registration, you can start adding a ‘New Diagnostic Water Test’.

## Fernox App Guide

### Adding a New Diagnostic Water Test

After downloading the app and completing registration, you can create a new **Diagnostic Water Test** by following the steps below or watching the **video guide.**

* * *

### Step 1: Start a New Test

1.  Open the app.
    
2.  From the dashboard, tap the **Scan Icon**.
    
3.  In the pop-up menu, select **New Postal Test**.
    
4.  Once your camera opens, point it at the QR code on the sample bottle to scan it.
    

* * *

### Step 2: Enter Customer & Location Details

Fill in the required fields:

-   **Customer Reference**: Add your own reference for reporting purposes.
    
-   **Project Reference**: Optional reference for your records.
    
-   **Company Name**: Enter the company name.
    
-   **Address**:
    
    -   Tap **Address Finder**
        
    -   Enter the postcode
        
    -   Select the correct address from the dropdown
        
    -   (Or choose from **Saved Addresses**)
        

* * *

### Step 3: Enter System Information

Provide details about the system being tested:

-   **System Type**: Select the system type.
    
-   **System Age**: Choose: 0–2 years, 2–10 years or Over 10 years.
    
-   **Heat Appliance Manufacturer**: Select from dropdown, search or manually add if unavailable.
    
-   **Heat Appliance Serial Number**: Scan QR/barcode using your camera or enter manually.
    
    -   _Tip: Important for manufacturer-related work and reporting_
        
-   **Heat Appliance Age**: Select heat appliance age range.
    
-   **Inhibitor Protector Used**: Select inhibitor protector used or add it manually.
    

* * *

### Step 4: Submit Sample

-   Select the **Reason for Sampling**;
    
-   Review your answers;
    
-   Tap **Submit.**
    

[

DWT Contents & Preparation

The Diagnostic Water Test is a comprehensive postal laboratory test for heating system water, providing a detailed analysis of the system and fill water samples. For a detailed, step-by-step guide on how to use the Diagnostic Water Test, please refer to the guide below.

](https://help.fernox.app/en/articles/116-dwt-contents-and-preparation.md)