Wiring a new thermostat

[Miss_e101]

Let me begin by saying that I'm not terribly knowledgable about home wiring, so please excuse anything glaringly stupid from me.

I wanted to replace my old Honeywell t40 with a horstmann centaur plus c27. The old stat only had two connections - brown wire (presumably live) to terminal 3 and a blue wire (presumably neutral) to terminal 1. This jives with the diagram on the back of the face plate.

I, perhaps naively, thought that I could make the same connections to the horstmann. Which I did, but the damn thing thing isn't working. The display is blank and no amount of resetting will get it to work.

I've been trying to research how to wire the horstmann but I'm lost. Does anyone have any advice?

Thanks. =)

 

[AndyPRK]

If your old stat had two wires, these are live and switched live (these are the terminal numbers you quote)
No neutral is present.

So you can't fit the item you want.

You could fit a battery operated programmable stat though.

e.g Drayton digistat (battery model)


A horstmann centaur plus c27 is a timer not a thermostat (temperature controller) so you wouldn't want to do that anyway.

 

[baileysufc]

Beat to it

 

[DetlefSchmitz]

The Honeywell just had two contacts which were joined together to start the boiler (live and switched live). The new programmer (not really a thermostat) need s live and neutral to power itself, plus a switched live connection to control the boiler.

The simplest solution is to take the controller back and choose a thermostat with no requirement to be powered (so no display), or a battery powered one.

[Beaten to it - but posted anyway].

 

[Miss_e101]

Ah, thank you all for the replies. Serves me right for dabbling in things I know little about. =) I will get it sorted in the end, though. Cheers.