[Dave]

OK, after blowing 3 fuses I now admit defeat & need some help

Trying to replace an old dial style room thermostat for a programmable Digital type. Run of the mill gas heating boiler, that heats water via Hot Water tank, & central heating .... so gravity fed system.

Here is the current wiring for thermostat



where it's wired 1) Red (L) , 2) Yellow (Load ?), 3) Earth, 4) Blue (N). This all works.

I thought this themostat might be suitable :- Horstmann Centaurstat 7 Programmable Thermostat - Screwfix.com, Where the Trade Buys where there is a PDF of manual, with page 2 showing wiring configuration (2.7MB)

Anyone with Electrics knowledge, able to advise if this thermostat should work ?

[silkstone]

Dave - Do you already have a separate controller in addition to the old roomstat? The one in your link appears to double as a timer/controller and a thermostat, and I'd have thought you didn't need anything as complex - a simple stat would be fine as a direct replacement.

[stepheno]

Simple answer....................
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. hire an H&V engineer. Tight git

[Steve]

LOL at Stepheno, was just going to reply with...if a job is worth doing properly, hire a professional

[Dave]

Have you seen how much a leccy charges these days .... all I need to do is disconnect 4 wires & reconnect. If you think I'm paying out a £50 min for that, your joking

[Steve]

Booom

[Dave]

lol. If I was rewiring a house I would use a leccy .... but I'n not going to let a bleeding thermostat beat me

[Steve]

RIP Dave Williams 1968-2007
last words..

"but I'm not going to let a bleeding thermostat beat me"

Loving father and husband but squeaked when he walked

[silkstone]

Originally Posted by Dave

Have you seen how much a leccy charges these days .... all I need to do is disconnect 4 wires & reconnect. If you think I'm paying out a £50 min for that, your joking

It's not the £50 for reconnecting four wires that's the issue. It's the cost of rebuilding after the fire.

[Dave]

lol.... it's only 4 wires <dave the bomb disposal expert >

[Dabhand16]

Originally Posted by Steve

RIP Dave Williams 1968-2007
last words..

"but I'm not going to let a bleeding thermostat beat me"

Loving father and husband but squeaked when he walked

[simpbow]

Ill take pity on you Dave, might have a plummer coming next week if thats any good, so i,ll show him this.

[brian wright22]

Dave, your new Room Stat will not require the Neutral connection. So tape it up or use one section of one of those connector blocks ( 5 amp ones will do) or the smallest you can get from B&Q etc.
You will only need to connect the Live and the Heating Load and possibly the Earth if its not double insulated
The new thermostat will have a thermistor to sense the temperature and unlike your old one which requires an accelerator heater ( usually in the form of a 100,000 ohm resistor ) to give a more e