Make sure the smoke detectors are installed correctly. I had similar
problems with newly installed detectors and after the usual ferrites, etc.,
come to find out they were not terminated properly. The end of the string
needs to be terminated with a load which was a different wiring
configuration scheme for the detector at the end of the chain. In Texas,
installations done by licensed installers require that the smoke detectors
be powered by only by the panel, e.g., battery powered detectors are not
allowed. Ken K5RG
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