How come it turns on and off all night (Frilight MS171NLBK LED Motion Sensor Courtesy Light - Black Base

Answer

Jan 22, 2026 - 03:56 AM

These little courtesy lights use a PIR sensor, and PIR doesn’t just see “people”, it reacts to changes in infrared/heat and sometimes electrical noise. The usual culprits in an RV at night:

HVAC cycling: furnace or heat pump starts/stops and warm air moves across the sensor. That temperature change looks like motion.

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Frilight MS171NLBK LED Motion Sensor Courtesy Light - Black Base - Warm White

The Frilight MS171NLBK is a motion-activated courtesy LED light, great for placing on stairways, inside closets, or other small spaces, hallways, bathrooms, bedrooms, and more. 120-degrees and 7 feet detection range.

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