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Thanks for all your help guys. I cracked it by testing all the wires with a multimeter while flicking the various switches on the old timer. Now all is well. :D

Sorry to be such a noob :wink: - possibly the below images will help...

Thanks for getting back to me guys. I seem to have 1 pump, a mid-position valve and no thermostat on the tank. Wire 1 = Live Wire 2 = Neutral Wire 3, 4 & 5 = ? - All are lives coming from power leads that run to a junction box in the airing cupboard where I have 1 pump, a mid-position...

Hello all - hoping you can help as I am totally ignorant in these matters :? I have a Thorn Olympic 38/50B with a Smith Controls SL650/2 timer. The boiler works fine, but the timer is one of those rotary switch-flicky jobs and has developed a tendancy to get stuck at 5.30am (when the...