I wrote several years ago about the dangers model 601 602 etc Chemetron Heat detectors pose how the terminals displace from the heat detectors very easily and will keep it from working
https://www.blogger.com/blog/post/edit/7038769389877256204/8437399952097669144?hl=en
As can be seen above in a recent bad heat detector found by a fellow alarm dealer .
They are no expensive to replace but there where so many of them put in field and hidden away in all kind of crawl spaces it will be many more years till they are all found and replaced.
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