It’s all in the yellow book, flow charts 9 to 11 and pages 46 to 57 and how to fix.

Central Heating Fault Finding Book
Don’t waste time guessing or phone a friend, this book has 90% of every popular fault known, with easy flow charts.
Don’t go to any boiler without this book, no manual no problem, worked for me for over 45 years

Central Heating Wiring & Controls Book 3
The most common control circuits in use in the UK are the three port (Mid Position) and 2 and 3 port zone circuits.
For many years electricians and heating engineers have commented that wiring heating controls is a difficult subject to learn, (this book is easy to follow) with APPs to download

Just order both books + CO2 chart, order value £40.00 incl. P&P no vat (normally £54.00)
UK Post Code only

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Our APPs are all one price £4.99 no vat
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