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Thanks Doc Hudson. As you say, the FBT4 schematic clearly shows the opposite to JJ Greenwall's contention. In any case, it's hard to believe that an experienced manufacturer would have got such an elementary thing wrong. Having said that, Timeguard's response to my enquiry was not quite what I...

Hello again Handysparks, A slight snag . . . I was about to order an FBT4 on Amazon (I'm in the same boat as yourself "due to forum restrictions") when I noticed the following review from "JJ Greenwall": "the wiring diagram is wrong; for some very odd reason, the fused isolator switch is...

Thanks very much for your advice, Handysparks and Lurch. Sorry for my delayed response. Yes, the Timeguard units are just what I need.

My bathroom’s central heating towel rail has an immersion heater with an on/off switch, wired from a switched fused spur in an adjacent cupboard. I’m forever forgetting to switch it off, after having intended leaving it on for an hour only. It needs a time switch The on/off switch is a short...