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HELP - i'm losing the will to live... I am trying to replace my central heating and hot water timer. The existing unit is a Randall 103, and I am trying to replace this with a Siemens RWB2. It should be same (or so i thought), as there are 9 wires. These consist of a live, neutral and earth...

Apologies if this subject is already covered. I have disconnected an existing double light switch and want to replace this with a dimmer. I have purchased a two gang two way dimmer and can't remember where the existing wires went on the old switch HELP! There are two red wires and one black...