Tap Sign In on the dashboard and register with your email address. You'll need your Gas Safe registration number — this is stored securely and never shared publicly.
2
Verify your email
Check your inbox (and spam folder) for a verification email from BoilerFix AI. Click the link to activate your account. Takes less than a minute.
3
Sign in for cloud sync
When you are signed in, your Bookkeeping and Job Calendar data is automatically synced to the cloud — so it's safe and available on all your devices. The sync indicator at the top of each page shows your current sync status (☁ Synced, 🔄 Syncing, 📴 Offline, 📱 Local Only).
4
Back up your data
Even with cloud sync active, it's good practice to export a backup file periodically. In Bookkeeping and Job Calendar, use the Export Backup button and save the file to Google Drive or email it to yourself. This lets you restore data even if you lose access to your account.
🔗 How customers & certificates work together
1
Add your customer in Job Calendar
Open Job Calendar, go to the Customers tab and add the customer. They then appear automatically in Customer Hub and anywhere else you select a customer.
2
Complete their details in Customer Hub
Open Customer Hub and fill in the customer's full details — including landlord details where relevant. This is the information that flows into your paperwork, so it's worth completing once.
3
Certificates fill themselves in
When you fill out a certificate — CP12, CP6, Warning Notice and the rest — and select that customer or landlord, their saved details populate the certificate automatically. No re-typing the same details on every job.
💼 Business Tools
👥
Customer Hub
See every customer's full history in one place — their jobs, invoices, quotes and certificates. Add a customer once and they're ready to select right across the app.
Tip: Complete a customer's details here and they auto-fill your certificates when you select that customer or landlord — no re-typing on every job. New customers are added in Job Calendar's Customers tab and appear here automatically.
📅
Job Calendar & Service Tracker
Schedule jobs, track service dates, manage customers and set service reminders. Colour-coded by job type, with alerts showing which customers are overdue for their annual service. When signed in, jobs and customers sync to the cloud automatically.
Tip: Add customers in the Customers tab first — their service dates then auto-populate in the calendar and service alerts.
💰
Create Invoice / Quote
Build professional invoices, quotes and estimates with your own logo and branding, then download as a PDF or email them to the customer. Quotes and estimates can be converted to an invoice in one tap, and long documents flow neatly onto multiple pages.
Tip: Your business details and logo are saved once and auto-fill every document.
📊
Bookkeeping
Track invoices and expenses, organise receipts by folder, and see your profit & loss and monthly income summaries, with Quotes & Estimates in their own tab. When signed in, all data syncs to the cloud; when not signed in, data is saved locally on your device only.
Tip: Sign in to enable cloud sync. Use Export Backup periodically as an extra safety net — especially before clearing your phone or switching devices.
🔑
Boiler Passport PRO
Register a boiler against a QR sticker, log every visit and service, and let the customer book their next service simply by scanning the sticker.
Tip: Stick the QR label on or near the boiler — a scan opens the booking page with the appliance already identified.
🔧 Boilers & Controls Diagnostics
🔍
Boiler Diagnostics
Search fault codes for all major UK boiler manufacturers — Worcester Bosch, Vaillant, Baxi, Ideal, Glow-worm, Potterton, Viessmann, Intergas, Alpha, Ariston and Main. Nearly 2,000 fault codes with descriptions, likely causes and diagnostic steps.
Tip: Select the manufacturer first, then enter the fault code. Works fully offline once loaded.
🔧
Service Mode Reference
Step-by-step instructions for entering Service Mode on 1,760+ boilers across 12 manufacturers, with combustion analyser targets and links to the relevant manuals.
Tip: Search by manufacturer and model. Combustion targets are shown where the manufacturer publishes them.
🔌
Controls Database
Wiring diagrams, fault codes and installation guides for over 200 heating controls across 40+ manufacturers including Honeywell, Drayton, Hive, Nest, Worcester and more.
Tip: Search by manufacturer or control model number. Tap any entry to expand wiring and fault details.
⚡
Wiring Diagrams
Interactive, colour-coded Y-Plan, S-Plan and combi wiring schematics you can follow on site.
Tip: Works fully offline once loaded — handy in airing cupboards with no signal.
🍳
Cooker & Hob Guide
Installation clearances, hot-zone rules and a pre-install checklist for gas cookers and hobs.
Tip: Check clearances to combustible surfaces before you start — it can save a return visit.
📞
Manufacturer Contacts
Direct technical support phone numbers for all the major boiler manufacturers, gathered in one quick list.
Tip: Tap a number to call straight from your phone.
🧮 Calculators
⚡
Gas Rating Calculator
Calculates gas rate using the 1-minute test method as per Gas Safe guidance. Supports both imperial (ft³) and metric (m³) meters. Enter the meter reading before and after the 1-minute test.
Tip: Ensure all other gas appliances are off during the test for an accurate reading.
🌡️
Heat Loss Calculator
Calculates building heat loss per BS EN 12831 to correctly size a boiler or heat pump. Enter room dimensions, construction type, U-values and design temperatures.
Tip: Use this before every boiler replacement to justify your sizing — it protects you if a customer ever questions the specification.
📏
Gas Pipe Sizing
Calculates maximum pipe run and pipe diameter for gas installations per BS 6891. Enter the appliance input, pipe length and pipe material to get the correct pipe size.
Tip: Always verify against the current edition of BS 6891 and the manufacturer's installation instructions.
🔬
IV Tightness Test Calculator
Carry out the let-by and tightness test to IGEM/UP/1B Edition 4 using the Installation Volume method. Enter your readings and it tells you whether the installation passes or fails.
Tip: Built around IGEM/UP/1B Edition 4 — the older meter-size method is replaced by Installation Volume, and a pipework-only retest is required after a Stage 1 pass.
📜 Certificates
📄
Gas Safety Record CP12
Generate professional Gas Safety Records (CP12) for landlords and letting agents. Fill in the form, sign on the canvas pad, then save as a PDF or email it directly from your phone or tablet.
Tip: Your engineer details auto-populate from your saved profile — you only fill in the property and appliance details each time.
🔧
Gas Service Record CP6
Complete the gas service and maintenance checklist (CP6) and issue it to your customer. Sign on screen and save or email as a PDF.
Tip: This is the service / maintenance record (CP6) — it's separate from the CP12 Gas Safety Record.
⚠️
Gas Warning Notice
Generate official Gas Warning Notices — ID (Immediately Dangerous), AR (At Risk) and NCS (Not to Current Standards). Includes all required fields and a signature pad.
Tip: Always issue a Warning Notice when you identify an unsafe situation — it protects you legally and is a Gas Safe requirement.
💧
Legionella Risk Assessment
Produce a Legionella Risk Assessment report for domestic systems, aligned with the HSWA, COSHH and the L8 Approved Code of Practice. Sign on screen and issue as a PDF.
Tip: Designed for domestic systems — record temperatures and any remedial actions before issuing.
🔥
Unvented Hot Water G3
Commission and certify unvented hot water storage vessels to Building Regulations G3.
Tip: Record the discharge arrangement and safety-device checks before issuing the certificate.
🌡️
TMV Commissioning
Work through the thermostatic mixing valve commissioning checklist and issue the certificate.
Tip: Record the measured blend temperature and the cold-water shut-off test.
💨
Fumes Investigation Report CMDDA1
Record a fumes investigation to BS 7967 and produce the CMDDA1 certificate.
Tip: Use alongside your combustion analyser readings when investigating an unsafe fumes situation.
⚠️ Compliance & Safety
🚫
Unsafe Situations
Complete reference guide covering 120+ unsafe situations with IGEM/Gas Safe classification. Includes the correct action to take (ID/AR/NCS) and the relevant regulation reference for each situation.
Tip: Works fully offline — ideal on site when you need to confirm the correct classification of an unsafe situation.
📚
Gas Safe Technical Bulletins
Quick reference to Technical Bulletin (TB) numbers, current safety alerts and links to the official Gas Safe resources.
Tip: Handy for confirming the latest guidance before you sign off a job.
📖
Boiler Manuals
Search and view installation, servicing and user manuals for all major boiler brands. Links directly to the manufacturer PDF — covers Worcester Bosch, Vaillant, Baxi, Ideal, Viessmann and more.
Tip: This tool needs an internet connection to download manuals. Save the PDF to your phone if you need it offline on site.
📋
Regulations & Standards
Quick reference to Building Regulations, the Gas Safety (Installation & Use) Regulations and the key BS standards you reference day to day.
Tip: A fast lookup — not a substitute for the full published standards.
📡 Offline & Data
📡
How offline works
Once you've opened BoilerFix AI with an internet connection, all tools are cached on your device automatically. After that, everything works offline — fault codes, calculators, certificates, calendar and bookkeeping.
Exception: Boiler manuals require internet to download the PDF. All other tools work fully offline.
💾
Where is my data stored?
When you are signed in, your jobs, customers, invoices and expenses are securely synced to the cloud (Supabase, EU-hosted). This means your data is safe and available on any device you sign in to. When you are not signed in, data is stored only on your device in browser storage and a local database backup.
Tip: Sign in to enable cloud sync. The sync indicator (☁ Synced / 📱 Local Only) at the top of Bookkeeping and Job Calendar shows you exactly where your data is at any time.
❓ Common Questions
Open Job Calendar and go to the Customers tab to add a customer. Once added, they appear automatically in Customer Hub and in the customer list wherever you select one — when booking a job or filling out a certificate.
Make sure the customer's details are saved in Customer Hub first. Then, when you fill out a certificate and select that customer or landlord, their saved details populate the certificate automatically — so you don't type the same information again on every job.
On the sign-in page, tap Forgot Password and enter your email address. You'll receive a reset link within a few minutes. Check your spam folder if it doesn't arrive. The link expires after 1 hour.
The offline indicator checks your actual internet connection, not just your signal bars. You may have a weak signal that isn't providing a real connection. Try moving to a better signal area or switching between mobile data and Wi-Fi. The indicator will automatically update when a proper connection is detected.
If you are signed in, your data is synced to the cloud and will reload automatically when you open the app. Try signing out and back in if data isn't showing.
If you were not signed in, data is stored per browser on your device. Clearing your browser's storage, switching browsers, or opening the app in a different browser will mean data isn't visible. Chrome data doesn't appear in Safari, for example.
If you have an exported backup file (.json), go to Bookkeeping or Job Calendar and tap Import Backup to restore your data.
Yes — when you are signed in, your Bookkeeping and Job Calendar data syncs automatically across all your devices. Sign in on any phone, tablet or computer and your data will be there. The sync indicator shows ☁ Synced when everything is up to date.
If you are not signed in, data is stored locally on each device separately. Sign in to enable cross-device sync.
Make sure you've selected the correct manufacturer first, then enter the fault code exactly as it appears on the boiler display. Some codes have a letter prefix (e.g. F.28 or E119) — try searching with and without the prefix. If the code genuinely isn't in the database, please email us at boilerfixai@gmail.com and we'll add it.
Yes. Your Gas Safe number is stored securely in your account profile (Supabase, EU-hosted) and is never shared with third parties or displayed publicly. When signed in, your bookkeeping and job data is encrypted in transit and stored securely. When not signed in, data stays entirely on your device and is never uploaded to any server. See our Privacy Policy for full details.
If you are signed in, simply sign in on your new phone and all your data will sync automatically — nothing to transfer.
If you were not signed in, on your old phone open Bookkeeping and tap Export Backup, then repeat in Job Calendar. Save or email both files to yourself. On your new phone, open the app, go to Bookkeeping and tap Import Backup, then repeat in Job Calendar. Signing in going forward will keep everything synced automatically.
Email us at boilerfixai@gmail.com — we read every message and aim to respond within 24 hours. For bug reports, please include the device you're using, what you were trying to do, and what happened instead.
The first time you open the dashboard, a short guided tour shows you what each section does, and the first time you open a tool a quick card explains it. To replay the dashboard tour any time, tap the guided tour banner at the top of this page.
Still need help?
Can't find what you're looking for? Get in touch and we'll help you out.