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Hi, I have just replace the room thermostat on my oil fired central heating system it is an RS1, which requires only 2 connections plus an earth. I had to get this one as the flex from the stat to the other boiler controls was 3 core, ie live, neutral and earth. My local plumber sold me the stat and said it would be fine, just wire up the live and neutral to the 2 terminals plus the earth wire. The heating comes on and stays on for 10 minutes, then it trips the RCD fuse and blows the fuse. Have you any advice please?

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Well in your case,if the central heating was working before you change the defective thermoatat.Phaps you have done the wrong connection of the thermostat,if you look well at the connection of the thermostat, how will you recognise the earth borne is that it is fixed to the body of the part,so this means that the thermostat 3 cores are (1) common,(2) normally close,(3) normally open.With a multimeter it be very easy to determine the core that you have to cannect.

Posted on Oct 05, 2009

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