CHAPTER 9: Troubleshooting Guide
Problem... | If the CO Alarm... | You Should... |
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The BATTERY light turns | Low battery warning. | Install a new 9V alkaline or lithium battery*. |
YELLOW. It flashes and the |
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horn “chirps” twice a minute. |
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Horn chirps and yellow service | Device is not working | Units under warranty should be returned to |
light blinks three times every | properly, and needs to be | manufacturer for replacement. See “Limited |
30 seconds. | replaced. | Warranty” for details. (Back Cover) |
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During testing, when you | Low battery | Install a new 9V alkaline or lithium battery*. |
press and hold the Test/Silence |
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button, the BATTERY light |
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turns YELLOW |
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Carbon Monoxide Alarm Only |
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CO alarm goes back into | CO levels indicate a | IF YOU ARE FEELING SYMPTOMS OF CO |
alarm 4 minutes after you | potentially dangerous | POISONING, EVACUATE your home and call 911 |
press the Test/Silence button. | situation. | or the Fire Department. If not, press the Test/ |
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| Silence button again and keep ventilating your |
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| home. |
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CO alarm sounds frequently | The alarm may be | Relocate your alarm. If frequent alarms continue, |
even though no high levels of | improperly located. Refer | have home rechecked for potential CO problems. |
CO are revealed in an | to “Where to Install This | You may be experiencing an intermittent CO |
investigation. | Alarm.” (Page 5) | problem. |
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Smoke Alarm Only |
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Smoke alarm sounds when no | Unwanted alarm may be | Clean the alarm’s cover with a soft, clean cloth. |
smoke is visible. | caused by non- | If frequent unwanted alarms continue, relocate |
| emergency source like | your alarm. Alarm may be too close to a kitchen, |
| cooking smoke. | cooking appliance, or steamy bathroom. |
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*For a list of acceptable replacement batteries, see “Regular Maintenance.” (Page 15)
If you have questions that cannot be answered by reading this manual, call Consumer Affairs at
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