RV CO & Propane Detector Safety: Placement & Expiry Explained

In this fast-paced two-minute tech tip, Todd from Big Beard Battery highlights a crucial but often overlooked safety issue in RVs—expired carbon monoxide (CO) detectors and incorrect alarm placement. Although these devices are lifesavers, they degrade over time and can give a false sense of security.

1. CO Sensor Lifespan

All CO detectors have a “born‑on” date stamped on them—this is not your install date. Over time, sensors accumulate contaminants, and manufacturers typically recommend replacement after 5 to 7 years. Even if your RV is new, the sensor might be older if it was in storage.

Pro tip: Remove the unit from the wall and check the back for the stamped date.

2. Why Expiry Matters

Older or expired CO sensors may respond slowly—or not at all—to rising CO levels. Since CO is colorless and odorless, a malfunctioning detector can put you and your family at serious risk.

3. Detector Placement in RVs

• Carbon Monoxide (CO): Slightly lighter than air—mount sensors near the ceiling.

• Propane (LP) Gas: Heavier than air—install these alarms near the floor.Many combo units are mounted arbitrarily and fail to detect one gas effectively.

4. What to Do When an Alarm Sounds

1. Immediately evacuate to fresh air.

2. Confirm nothing is burning or producing CO/LP inside—no generator or stove running.

3. If the alarm continues, re-enter in fresh air conditions and check the sensor’s born-on date.

4. Replace the unit if it’s near or past its expiry.

5. Summary

• Check your CO detector’s born‑on date monthly.

• Replace every 5–7 years.

• Install CO alarms high, propane alarms low.

• If alarm sounds, prioritize evacuation and inspection.