Quote:
Originally Posted by Bill-n-Brillo
Ray -
Here's a User Manual I found for your detector. Perhaps it's the same as what you already have.
http://www.alarmsystemsdist.com/mc_f...20BN-manua.pdf
Educated guesses here:
- Could be dust collecting inside the detector housing.
- Are the batteries you're using alkaline/lithium? That's what's recommended in the manual.
- The detector might have failed. Try the "Weekly Testing" as described on p. 5.
Hope that's of some help.
Bill 
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I believe when you change the batteries you are required to do a test. the chirp as desribed might be a signal that the test was not performed? Just a thought