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BRK 670MBX Beeping three times every 25 minutes

Guest Anxious-Daddy

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Guest Anxious-Daddy


We have two BRK 670 MBX smoke alarms connected together in our hallway and landing; one up one down. We've been in the house for 8 months and the alarms were manufactured in 2016, so are 6 years through their 10 year life. I recently replaced the batteries and reset both alarms. But still, the downstairs alarms beeps 3 times every 25 minutes, followed quickly by one beep of the upstairs alarm. (Weather conditions are warmer than usual today, but it only started at 9pm.)

Help appreciated, thank you

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