LP / Propane Detector

An LP / propane detector is a safety device mounted near the RV floor that detects propane gas leaks. Because propane is heavier than air, it settles to the floor — a low-mounted detector catches leaks before they accumulate to dangerous levels.

Required equipment on all modern RVs and a critical safety component.

How it works

• Sensor monitors air quality near the floor
• Powered by 12V house battery continuously
• Triggers loud alarm when propane concentration exceeds safety threshold
• Some detectors automatically shut off the propane supply

Testing

Most detectors have a test button. Press it monthly (or before each trip):

• Working detector emits a loud alarm
• Reset after the test
• Replace battery if low-battery warning

If pressing the test button does nothing, the detector is bad and the rental should be swapped.

What to do if the alarm sounds

1. Don’t ignore it. Propane leaks are dangerous.
2. Leave the RV immediately.
3. Open windows and doors to ventilate
4. Don’t use any electrical switches (sparks)
5. Don’t use any open flame
6. Shut off propane at the tank before re-entering
7. Call rental company roadside assistance

Expiration

LP detectors typically last 5-7 years. Check the expiration date at pickup — most have a date printed on the front. An expired detector should be replaced before the rental departs.

False alarms

Common false-alarm causes:

• Battery very low (replace and retest)
• Sensor end-of-life (expired; replace)
• Recent propane fill (vapors during fill can trigger; wait 30 minutes)
• Spray cleaners containing alcohol (will trigger; ventilate)

False alarms should resolve quickly. Persistent alarms indicate either a real leak or a failed detector.

In rental walkthroughs

Ask during the walkthrough:

1. Where is the detector?
2. What’s the test procedure?
3. When does it expire?
4. What’s the response protocol?

If the rental company can’t answer or the detector is expired, ask for replacement before driving away.