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How do I test my FA3820-EUX10 carbon monoxide alarm?

General

23 April 2026

Press the test/hush button on the FA3820-EUX10. You will hear two loud sequences of four beeps and the LED will flash, confirming the alarm is working. Test at least once a month and vacuum around the unit every six months to remove dust. See our full guide to testing your CO alarm for more detail.

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