Central Heating

Replacing Potterton EP2002 & EP2 Programmers

29 March 2014

The Potterton EP2000 and EP2002 has now been superceded by the EP2. Check availability and prices for the Potterton EP2 Programmer. [Show as slideshow] I’ve seen quite a few of these Potterton EP2000 programmers on various jobs lately. They’re a large version of the old type mini minder central heating control timer and allow more […]

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Central Heating Boiler Constantly Running Problem

20 May 2013

Q- Hi, I’ve discovered the other day that an oil boiler was running even though heat and hot water turned off at programmer. I thought it was the timer and i replaced it but lady said problem remained. I have tested the 2 valves grey and orange wires and not closed, have tested cylinder stat […]

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Wiring Diagram of S Plan Central Heating System

22 February 2012

This article shows a typical S Plan wiring diagram and gives an overview of the electrical control wiring connections for a Sundial / Honeywell SPlan or Drayton Twin Zone Central Heating system. Online Training        City+Guilds Training Find ‘Central Heating Controls’ on EBAY… (To enlarge image click once, and then double click in new window) Please note […]

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Wiring of C Plan Central Heating System

22 February 2012

This article shows a typical C Plan wiring diagram and gives an overview of the electrical control wiring connections for a Sundial / Honeywell C Plan Central Heating system. (To enlarge image click once, and then double click in new window) Please note that this is a guide only and the terminal numbers and wiring […]

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Wiring of W Plan Central Heating Systems

22 February 2012

This article shows a W Plan wiring diagram and gives an overview of the control wiring connections for a typical Sundial / Honeywell W Plan Central Heating system.  (To enlarge image click once, and then double click in new window) Please note that this is a guide only and the terminal connection numbers and wiring […]

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Wiring of Y Plan Biflow Central Heating Systems

22 February 2012

This article shows a Y Plan wiring diagram and gives an overview of the electrical control wiring connections for a typical Sundial / Honeywell YPlan or Drayton Biflow fully pumped central heating system which use a mid position motorised valve. Online Training        City+Guilds Training        Electrician’s Insurance (To enlarge image click once, and then double click […]

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How To Connect A Central Heating Boiler

19 January 2012

This article explains how to connect a boiler to a new or existing central heating system with pump over-run. The boiler wiring diagrams show some of the most commonly found domestic boiler control panel electrical connections. Find Central Heating Controls on EBAY… or Buy Zone Valves… Electrical Connections to Boilers Please Note- Only competent and […]

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How does a Y Plan Central Heating 3 Port Mid Position Motorised Valve work?

2 November 2011

Find Mid Position Valves on EBAY… This interesting article is from DIYFAQ.ORG.UK with links to WIKI for further info. It shows a circuit diagram and explains the internal workings of the 3 Port Mid Position Central Heating Valve commonly used in Honeywell Sundial Y Plan (4073A) and similar Drayton Biflow systems. There’s also some useful info on faulty and stiff […]

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