The combination of the single factors is what makes me suspicious, as well as the choice of position of the sensor; it gives me the idea of a builder doing a heating job.
I've fitted well over thirty of these and the new ones (well not me personally, the bold spark I use has) and I think we've had two that have gone toes up and they were both the new CM927 models.
They are pretty reliable as are, I have to say, the WB DT10RFs I've been using for the past 18months.
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