If the fire alarm blinks for 30 seconds, it indicates that there are some serious problems in the unit. It also indicates that you need to test the fire alarm. The fire alarm blinks for 15 seconds if the unit needs maintenance, and due to lingering smoke. The fire alarm blinking red for 15 seconds means that there are moderate issues with the unit.
It usually indicates that the batteries are low on charge, the batteries are not installed correctly, and dust is accumulated in the alarm. If a fire alarm blinks for only 10 seconds, then it mostly indicates that there are minor issues with the alarm. The red light can blink in the fire alarm for both minor and major issues. If the fire alarm blinks a red light for 10, 15, or 30 seconds, then it means that there is a problem with the fire alarm.
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