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    Can battery voltage be too high for Yale PIR to work?

    I have a Yale HSA6300 system which has worked fine for about 2 years. One of the PIRs has now said it needs new batteries but when I install three new AAA batteries, the PIR doesn't initialise. I checked the voltage of the new batteries and it's 1.6V each (nominal 1.5V). I've tried with two...
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