A great little timer which must be wired correctly.
This is a great little timer. It must be wired correctly though. I suspect that reports of it failing and 'blowing up' are probably user error. It has been in my bathroom extractor fan for a couple of weeks and so far has done the job expected.
When converting the fan, and as the yellow wires require a volt-free switch, I used a relay. So the old switched live switches the relay, and the relay switches the timer.
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