Carbon Monoxide Alarm Beeping Guide

Four Beeps, Pause, Repeat

Four loud beeps with pauses may indicate a carbon monoxide alarm condition. Get everyone to fresh air first, including pets if possible.

• Move outside or to fresh air immediately.
• Call local emergency services from a safe place.
• Do not re-enter until the area is checked and cleared.

Single Chirps or Trouble Signals

A single chirp may be low battery, end-of-life, or a device trouble signal rather than a CO alarm condition. The exact meaning varies by model.

• Read the device label and manual.
• Replace batteries only according to instructions.
• Replace expired or malfunctioning alarms.

Symptoms Matter

Headache, dizziness, nausea, weakness, confusion, chest pain, or flu-like symptoms can be signs of carbon monoxide exposure. Symptoms make the situation urgent even if the beeping pattern is unclear.

• Do not lie down or wait inside.
• Call emergency services from fresh air.
• Seek medical advice if symptoms are present.

After the Area Is Safe

A qualified technician should inspect fuel-burning appliances, vents, chimneys, garages, and other possible sources. A cleared alarm does not by itself prove the underlying cause is fixed.

• Check furnaces, water heaters, fireplaces, stoves, attached garages, and vents.
• Follow responder and technician guidance.
• Replace alarms according to manufacturer life span.

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