Replacing wall mounted room thermostat - Please help!

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Hi there, new on here so hopefully I have put this in the right place!

Basically I need to replace my ancient room thermostat that has stopped working. I have a conventional boiler with a hot water tank in the loft and the boiler heats both hot water and central heating.

I have removed the wall mounted room thermostat (acl ts142) and was wondering what type I needed to replace this with.

I have 3 wires coming out the wall behind the thermostat, Red, Black and Green. Presuming that this is live, neutral and earth, I am unsure as to what type of unit I can replace that with as most units seem to require 3 different wires.

Any help would be much appreciated!
 
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If I remember your original stat correctly it should have 4 wires.

Call from timer
Switched live to controls
Earth
Neutral

So with three wires you are either missing the earth or the neutral.


Which is it?

Time fort some back tracking.
 
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There were only 3 wires attached, to terminals one two and three. In the instructions inside the casing for the old one it says "always connect neutral to 4". The unit it's self has a wire running from terminal 2 where neutral was connected to terminal 4. This wire looks factory fitted, runs underneath all other components and seems to have a small resistor or something on it! Any the wiser?!
 
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There were only 3 wires attached, to terminals one two and three. In the instructions inside the casing for the old one it says "always connect neutral to 4". The unit it's self has a wire running from terminal 2 where neutral was connected to terminal 4. This wire looks factory fitted, runs underneath all other components and seems to have a small resistor or something on it! Any the wiser?!
Are the terminals labelled (apart from the numbers) or is there a wiring diagram on inside of case?
 
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