Controls, wiring, diagnostics
Reference tools and learning resources for competent professionals working on domestic heating controls and electrical fault diagnosis.
Who it's for
Most gas qualifications test safe isolation. Wiring and diagnosing the controls themselves is often left to a separate short course, or to experience. Heating Decoded is aimed at that gap.
- Competent domestic heating engineers
- Qualified gas engineers working on heating controls
- Electricians with relevant competence
- Heating supervisors and technical managers
- Training centres and colleges
- Other suitably competent professionals
Not a DIY guide
Heating Decoded isn't a DIY repair service. It's written for people who are trained and competent to work on heating controls and mains electrics.
A method, not a pile of diagrams
Know the sequence
Start with what the system is meant to do, in order, when there's a call for heat.
Read the wiring
Interpret the control arrangement in front of you, not the one you expected to find.
Expect the behaviour
Know what each control should be doing at each stage, so the odd one out stands out.
Test safely
Apply safe isolation and the right electrical tests before you touch a terminal.
Read the result
Understand what a reading tells you, and just as importantly what it doesn't.
Move on logically
Let each result decide the next step, rather than swapping parts and hoping.
Four tiles, four parts of the job
The Heating Decoded symbol stands for electricity, resistance, water and heat. Pick a tile to see the planned topics that sit under it.
Electricity
The supply and the switching: where the power comes from and what's controlling it.
- Electrical controls and components
- Safe isolation principles
- Electrical testing principles
Planned topics. They may change before release.
Resistance
Measuring what's really there, and knowing what the reading means.
- Resistance testing
- Continuity testing
- Understanding diagnostic results
Planned topics. They may change before release.
Water
The system itself: how heating and hot water are zoned and controlled.
- S-Plan, Y-Plan and S-Plan Plus systems
- Approved wiring diagrams
- Quick-reference information
Planned topics. They may change before release.
Heat
The result: a boiler that fires when it should, and only then.
- Interactive Fault Atlas
- OpenTherm and modern control systems
- Structured fault investigation
Planned topics. They may change before release.
Three products, one family
Heating Decoded app
In developmentThe main companion app. An interactive Fault Atlas, S-Plan, Y-Plan and S-Plan Plus reference, safe testing principles, OpenTherm and modern controls, all searchable and linked to the manual.
About the app
The Domestic Heating Diagnostic Manual
Coming soonA printed reference with clear explanations, approved wiring diagrams and structured fault-finding methods. Lay-flat, full colour, and made to be used on the job.
About the manual
Heating Decoded Part Finder
In developmentA separate companion app for identifying heating controls and components, with ControlSwap built in to help pin down the programmer or control already on the wall.
About Part FinderRead this before you use any technical content
Heating Decoded is for competent professionals. It doesn't replace manufacturer instructions, BS 7671, the Gas Safety (Installation and Use) Regulations, safe working procedures or your own professional judgement. Isolate and prove dead before you work on any circuit, and follow the instructions for the specific product in front of you.
Questions people ask
Is Heating Decoded available yet?
Not yet. The app and Part Finder are in development and the manual is coming soon. Nothing is on sale and there are no app store listings. When there are, they'll be linked from this page.
How much will it cost?
Prices haven't been confirmed. We'll publish them here once they're agreed, and not before.
Can I use it for DIY repairs?
No. Heating Decoded is written for competent professionals who are trained to work on heating controls and mains electrics. It isn't a DIY repair guide.
Will there be a PDF of the manual?
No. The manual is a printed book and no PDF version is planned.
Does Part Finder check stock or prices?
No. It helps you identify products and can link to selected merchant pages, but it doesn't check live stock and doesn't guarantee prices or availability.
Is Heating Decoded endorsed by any manufacturer?
No. Heating Decoded is independent. Where it names a manufacturer or a product, that's to help you identify it, not a sign of endorsement or partnership.
Can colleges and training centres get it?
We'd like to support colleges and training centres. If you run one, get in touch and tell us what you need. We'll come back to you when ordering details are ready.