...replace an old room thermostat with a new one. The...

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Question by Peter G
Submitted on 3/10/2004
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I want to replace an old room thermostat with a new one. The wiring to the old consists of 4 terminals - a copper, a red wire, a yellow wire and a green wire. How do these wires relate to the new system, where I only have 3 terminals? (UK)

Answer by Farton
Submitted on 10/23/2004
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Just a guess as I cant see your new thermostat. There are two answers. 1, The bare copper wire which is your earth wire may not be needed on this new thermostat as it is plastic double insulated. 2, You may have purchased the wrong switch as some use 2 + earth and others 3 + earth. Go to the manufacturers website for help. Hope this helps. Get back if you need some more.

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