Quote:
Originally Posted by songkrai
I hope that you have better luck than I - with a combo unit.
Went to store few years ago and purchase 3 brand name combo units. Hard wired units with backup battery.
All within three years malfunctioned. No way to stop the beeping. On all. Multiple new batteries of different brands and stores. No it was not one bad batch of batteries from a single store.
Changed tactics. Replaced all with standard hard wired smoke alarm. Then purchased separate carbon detectors that work by battery. No beeps since.
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Not sure on this, but one bad device may have sent a pulse causing the other two to also chirp if they were interconnected. Many devices say in the instructions to push the test button after changing the batteries. Its also very important to check and make sure the devices are compatible with each other. Most seem to be but not always! Glad to hear you installed devices where the defective units were and not just disconnect them.