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    Worcester Bosch 40Cdi - wiring new thermostat

    I've Solved the problem I spoke to Worcester Bosch again - but this time asked a different question. If I want to install a hard wired thermostat programmer, do I need a new plug in board? The boiler currently has a plug in board on the front, that got installed when I installed the DT10RF...
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    DT10RF optimiser dropping connection

    I've been having this exact problem ever since I got the damned wireless thermostat. It's never been 100% reliable. I'm now replacing it with a wired stat - question is - how do I wire the new stat? manwithspanner - mentioned that he removed the front plug-in plate. Do you need to do...
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    Worcester Bosch 40Cdi - wiring new thermostat

    Firstly thank you for all the help so far - it really is much appreciated. I've removed the Neutral wire from the UFH to Boiler connection. I now have only 1 wire connected from s/l on the UFH to LR on the boiler. Result - the system still works. However, it works exactly as it did...
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    Worcester Bosch 40Cdi - wiring new thermostat

    So I'm only connecting one wire? That seems odd. But at the same time it does make sense. So its like the UFH is sending a pulse along the wire, to turn fire up the boiler. When it stops, there is no pulse and so the boiler shuts down. When I do that (will give it a try tomorrow in the...
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    Worcester Bosch 40Cdi - wiring new thermostat

    So - to summarise You are saying my s/l wire (labelled s/l on UFH), should go to Ls and the Neutral wire (labelled neutral from the UFH) should go to LR on the boiler or the other way round?
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    Worcester Bosch 40Cdi - wiring new thermostat

    So If I was connecting a two wire stat - I would use? Ls & LR? That's what I don't understand. In theory my underfloor heating control should put out two wires - they demand the boiler to turn on. But, they are listed as a Neutral and a s/l (I presume switched live). So, I connected them...
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    Worcester Bosch 40Cdi - wiring new thermostat

    I just found the installation instructions for the boiler. This is where the confusion has always been. The 40Cdi want you to have 3 wires from your thermostat/programmer. My underfloor heating exports two wires. Not three. I would have thought a thermostat normally only has two wires -...
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    Worcester Bosch 40Cdi - wiring new thermostat

    I can see your point Matt - to get my system running perfectly as 2 zones, I would need a second two way valve on the radiator side. I'd presumably place that just before the Flow pipe separates - where it T's and one pipe goes off to the UFH (which has its own 2 way valve) and the radiator flow...
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    Worcester Bosch 40Cdi - wiring new thermostat

    So my u/f is wired correctly (I'm amazed). The water is all internal, it's a combi boiler. So the rad circuit is also internal, in the sense that it runs using the boilers own pump etc. You say I need to add one to the Rad circuit - add what exactly? When you say disconnect the call...
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    Worcester Bosch 40Cdi - wiring new thermostat

    No problem Matt - here is a picture of the u/f heating wiring centre side. The following images show the wiring centre and its diagram. It's wired exactly as shown. The connection to the boiler is as in Diagram 1 at the bottom. So it says to wire to N and s/l - unfortunately my boiler doesn't...
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    u/f wiring centre diagram
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    U/F Heating Wiring Centre
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    U/F heating wiring diagram - to boiler side
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    Worcester Bosch 40Cdi - wiring new thermostat

    Sorry - maybe I wasn't very clear. I am NOT putting in a stat for the u/f. It already has one installed. There are two parts to my original question. 1/ in my current set-up, I think I have things wired wrong. The wiring in the u/f side is fine in the wiring centre, but where it connects to...
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    Worcester Bosch 40Cdi - wiring new thermostat

    Hi - my 40Cdi has a wireless optimiser thermostat. I want to replace this with a fixed hard wired thermostat. I presume that this only needs 3 wires - one of those being an earth - so essentially 2 wires. Which terminals should these two wires go to inside the boiler? Seems like I have...
  18. Worcester Bosch 40Cdi

    Worcester Bosch 40Cdi

    wiring inside boiler
  19. Boiler

    Boiler

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