Fitting a thermostat…. What’s to know?

as in CH thermostat?

If so, does it connect to the Boiler direct (modern Combi style system) or in between the timer and the boiler (older style system)?

Mechanical ones are just two wire (basically a switch which is closed when cold and open when warm). A more fancy wifi remote controlled thing will need power, so will be 3 wire, L, N and switched).

OK. I have a thermostat now. It connects to a basic condenser boiler.

What do I do with the red, yellow and blue based on this guidance?

There’s a timer in with the boiler. Big clunky thing with a b c d dials on it and various water on/off, heat on/off settings

RIPook.

If you die can I have your bike?

In seriousness,

You need to identify what those wires are, and basing that solely on the colour of the insulation is a Really Bad Idea. For all you know that was wired in by someone with no real idea asking for advice on an unrelated Internet forum, they could be anything.

The bike’s as shambolic as my wiring

😯

That’s all.

With some basic instruction, common sense and no risk taking, it cannot be that hard to put the right wires in the right slots.

That’s my logic

Red to A
Blue to B
Yellow either mask off or fit to one of the spare connectors x/y.

* Assuming that whoever wired your place up has red = live, blue = neutral, yellow = earth.

Was there a previous thermostat in situ which you’re replacing or is this all new ?

Yeah but the plasterer smashed it. It was ancient anyway

Aye its only electricity and gas what could go wrong 😉

I would do ti myself but no way am I giving advice over the internet on this one

PS is it the honeywell remote thermostat thingy?

If so that is your receiver thingy and not the thermostat thingy [ i have kept this as technical as i reckon you can manage

Red to A (live)
Blue to B (Neutral)
Yellow to C (Switched live)

I’m pretty confident about the above based on the diagram, but IANAE.

Yeah it is. Have I got the wrong bloody part then?

Call me old fashioned, but I always consider money paid to a professional to ensure I don’t die, or my house doesn’t burn down, is generally money well spent

Have I got the wrong bloody part then?

Probably not, the receiver replaces the old-skool thermostat, the wireless transmitter can then go anywhere you like.

I replaced my old thermostat with a Heatmiser wireless thing last year, very similar to what you’ve got but with one more connection to make and a much more confusing diagram.

😯

You sure about that ? Which of the “typical wiring connections” shown in the instructions matches that config ?

All that does is replace the on off switch of the boiler [ probably]- well it does on mine so what he said above also not an electrician

Worst case scenario you die ,middle case scenario it does not work best case it works but you do not know why 😉

is this what you are trying to install?

if so it is powered by batteries and does not need wiring
the receiver needs wiring into the boiler

WHAT ARE YOU TRYING TO INSTAL

A Honeywell 907 programmable thermostat

WHAT ARE YOU TRYING TO INSTAL

One of these?

YES!

Well, that’s just some random pic off the net. So who knows if it’s wired right.

…but it does demonstrate they are wired in directly.

Like the Dutch do 😀

[video]https://www.youtube.com/watch?v=ViNG0J-4Zfw[/video]

This might be more helpful: http://www.diynot.com/forums/viewtopic.php?t=79002

Are you still alive? 😯

mine has a separate receiver and the thermostat is battery powered

I am oot

I’m alive. Having my tea.

Come on adey, you’re a spark. What’s the deal?

Bit early, innit?

Not for my 18 month old. I’m joining him.

Can’t say without seeing where the other end is connected! Stick your tongue on it and see if it’s live 😀

Are you anywhere near Pembrokeshire? I’ll come and look at it for you.
Rich.

Sheffield 😀

Rich, that’s a very kind offer, but is anyone anywhere near Pembrokeshire? 🙂

As Popacapeti says ,look in your boiler wiring for that three core cable. I’ll wager only the red & blue are terminated.check boiler installation booklet.I’ve wired a few in my time :wink:,all it is, is an on off switch …
Disconnect in your boiler, wire up the thermostat A&B, reconnect boiler.
Did the plasterer cut the cables when he smashed the old one, presumably he still has the old thermostat for reference?

I’ll dig around. I think it’s in the garage

Rich, that’s a very kind offer, but is anyone anywhere near Pembrokeshire?

😆

Old thermostat binned. Can’t make head nor tail off the boiler end of things!

OK. Boiler is a combi with built in timer etc.

Stat. is battery powered so doesn’t need a permanent live.

Connection C isn’t required. Only A and B.

A is the connection from the boiler which goes live when the central heating timer switches on.

B is the return from the stat. which goes live when the stat. calls for heat.

The 3 core is a legacy from a previous boiler that had a mains powered stat.

You need to look at the boiler installation diagram and identify which is the output from the timer and where the switched live goes to inside the boiler (which will fire the boiler and run the pump).

The wires may already be connected, or you (I) may need to work it out.

What is the boiler make and model and I’ll look up the manual online.

I may need you to take the boiler cover off and take pictures. 😯

Rich.

I’ll have a look when I’ve not had a beer…

I’ll keep an eye on the post tomorrow. We’ll crack it.I’ve got no-one else down here to talk to. 🙂

Rich.

You’ll need to switch the old stat in the boiler onto “permenant heating” one you have it hooked up. If you can find the manual for your boiler you should be able to identify what each core is connected too at the other end, and then it should make sense.

Red to yellow
Yellow to red
Blew to bits.

Dont chicken out now man 🙄