It might be time to get a new CO detector. They have a limited "life span." We just went through the same thing with my Mom in law's detector. Changed batteries and still, the chirping...off and on. Went online to read about the detector she had and discovered the life span of the thing....5 years. You might want to check on how long you can expect the one you have to work. Bought a new detector, installed the batteries, connected it to the correct wiring and all is well once again.
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Namaste y'all
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