No power getting to a Baxi boiler

[Pearlyman]

I completely understand where you are coming from…
I guess it is just that if I had made a mistake with the yellow wire, for example, could the rest of it be close enough to work – somehow ?!

I just keep thinking that it can’t be that complex…
I’ve got a cable going to the room stat; a cable going to the boiler and a cable going to the airing cupboard.
The rest of the ‘circuit’ is on the wall in front of me, in the form of the power supply switch and the timer.

Is there anyway the power supply switch and the timer could be wired up – just using the 3 cables that I mention, so that they would work as they should ?

Whatever I’ve done, the extent of it should be contained to the components I’ve just mentioned….

I’m certainly not averse to getting in an electrician (in fact, I have been trying to find one) – though I’m fearful that they will come in, see what is in front of them and have exactly the same issues/concerns that you have..!

 

[EFLImpudence]

Well, you can start by swapping the timer L & N. That can't be right.

Then follow the diagram one part at a time.
See where all the wires from the main switch go, then the next step and so on.

 

[Pearlyman]

OK.
I'll look to map out what I think tomorrow - and maybe you can check it before I actually do anything...

Just to confirm though, with the 'components' available to me (cables going to the room stat, boiler and airing cupboard - plus the power switch and timer) do you think it should be possible for me to wire up somthing that will work ?

 

[EFLImpudence]

The thermostat is wired correctly. That's a start

 

[Pearlyman]

LOL ! Though is that true at both ends of the cable..?!

I think that is my point.
I have certain physical limitations that I can't overcome (and so I may struggle to match the set-up in the diagram).
I only have 1 X 3 core cable going from the timer to the boiler. I can't change that. Where in the timer should I attach those 3 wires...?
Similarly, I have 1 X 3 core going from the room stat to the power supply - is it correctly connected in the power supply switch ?
If I can solve those 2 issues, it only leaves me with the 3 core cable that goes into the airing cupboard - and the connections between the power supply switch and the timer.

Put like that, the whole thing sounds a lot simpler

 

[Pearlyman]

I've just had a quick look in the airing cupboard and based on the colour/size of the cable, I think it is going to the central wiring box...

We would therefore have 3 fixed points: the room stat; the boiler and the central wiring box - coming from a hub of the power supply switch and the timer.

With those constraints, is it possible to say whether things could be wired up so that they would work as they should..?

 

[EFLImpudence]

From what I can see I will give the following advice.
It is up to you to verify that the wires go to where I think.

As it seems to be wired I have no idea how it worked (properly).

I shall ignore the CPCs (earths) as they should be connected together wherever they occur.
The same for the Neutrals but beware that not all Blue or Black wires may be Neutrals. Where they are used as live conductors they should be marked in Red or Brown.

You have stated that at one position there is a Blue connected to Green&Yellow. This is obviously wrong but may have been done because of lack of wires.


Any way -
L,N,E supply to main switch feed.
L,N,E from main switch load to L,N,E on timer.

Cable from Room thermostat.
Red to Timer CHon Black
Yellow to CH valve control
Blue to Neutral.

The Brown in HWon may be a Permanent Live to the boiler.
You must verify this. If so connect to L at Timer.
In any case it should not be in HWon.

The two G&Y in the connector block at the Timer should be connected to the Earth terminal of the Timer.

The Black in HWon should be connected to the Tank thermostat.

That will be the Main switch, Timer and Room thermostat connected properly with the proviso that you must find out exactly where the Brown originally in HWon goes.

 

[EFLImpudence]

A picture of the wiring centre would be helpful.

 

[EFLImpudence]

Just thought.

The two G&Y connected at the Timer may be being used for something else other than earth.
Very naughty so you will have to determine whether this is so.
Do not connect to earth terminal yet.

 

[Pearlyman]

Good afternoon - and thanks once again for all the help/support you are providing on this - it really is appreciated...

I've taken a photo of the wiring centre which is shown below:

View media item 66647
There are 7 cables going into/out of the box:

3 grey ones (I think they are all 4 core - RYB and copper). I think one is coming from the power supply switch - but I've no idea where the other 2 go...
2 black ones. They go to the 2 valves.
2 white ones. One goes to the hot water stat, the other to the pump.

I'll need a little time to digest and consider your previous posts.
Rest assured, I won't do anything without double checking - or if I am in any doubt whatsoever !!

 

[Pearlyman]

OK – a few questions !!

L,N,E supply to main switch feed.
L,N,E from main switch load to L,N,E on timer.

I’m happy enough with that !

Cable from Room thermostat.
Red to Timer CHon Black

Presumably you mean, red to CH On in timer via black (connected in power supply pattress)

Yellow to CH valve control

If I connect the yellow from the room stat to the yellow going to the wiring centre, will I achieve that ?

Blue to Neutral

Is this the neutral in the power supply switch (if so, which one) – or the timer ?

The Black in HWon should be connected to the Tank thermostat.

As with the yellow above, how should I achieve this ? (presumably by connecting to the cable that goes to the wiring centre ?)

The Brown in HWon may be a Permanent Live to the boiler.
You must verify this. If so connect to L at Timer.
In any case it should not be in HWon.

With regard to this – how did the boiler ever receive power ? It only has one cable, containing the 3 wires, connected to it (from the timer).
You can see on the timer photo how it was connected up – where could it have been getting it’s power from ?

 

[EFLImpudence]

Is it possible to straighten the wires in the wiring centre and post another picture so that I can tell which wires come from which cables?

 

[EFLImpudence]

Is it possible to straighten the wires in the wiring centre and post another picture so that I can tell which wires come from which cables?

Do this before I answer the above.

 

[Pearlyman]

There are a lot of wires in there !
Which ones in particular are you interested in..?

 

[EFLImpudence]

All of them. Can you spread them out?