The Domestic Heating Diagnostic Manual
Controls, wiring, testing and fault finding, in a printed manual made for the job. Coming soon.


Written to build competence
Knowledge creates confidence.Understanding creates competence.Competence creates safer systems.
A specialist technical manual for competent professionals working with domestic heating electrical controls and fault diagnosis. Published by Project50 Ventures Ltd.
What's inside
Clear technical explanations, approved wiring diagrams, fault-finding methods and structured reference information, in one book.
- Fault finding. Structured methods for working through electrical control faults.
- Wiring diagrams. Approved diagrams, reproduced exactly as approved.
- Components. What each control does and how it's connected.
- Systems. S-Plan, Y-Plan and more.
- Learn. Build the knowledge behind the method.
- Quick reference. Key information at a glance.
The format

Why it lies flat
A wire-bound book stays open at the page you need, on top of a cylinder, on a van floor or next to the boiler, without a hand holding it there. The laminated cover is there for the same reason. It's meant to be used, not kept nice on a shelf.
Coming soon, and print only
The manual is still going through technical approval. It'll be available once it has been approved, printed and is ready to send. There's no PDF version and none is planned. Ordering, college purchasing and bulk-order details may follow.
Questions people ask
When will the manual be available?
Once it has been technically approved, printed and is ready to send. There's no date yet.
Is there a PDF or digital version?
No. It's a printed book, and no PDF version is planned.
How much will it cost?
The price hasn't been set. It'll be published here when it is.
Does it work with the app?
That's the plan. The app is being designed so its diagnostic information links to the matching sections of the manual.
Can a college order copies for students?
We expect to take ordering enquiries from colleges and training centres. Get in touch and we'll let you know when details are ready.