Why is my PA-I blinking a cycle of red at all AQI levels?

With wildfire smoke back, I have plugged in a PA-I indoor sensor I haven’t had plugged in in a while. It shows on the map just fine (Real-Time Air Quality Map | PurpleAir) and is showing AQI levels that should be in the green, like 30.

But after showing blue during the boot process, the unit seems to only show a cycle of red at different brightnesses-- about half a second at each level of red, stepping up and down through a series of brightness levels.

What does this mean? (I worry if I can trust the “green” data on the map if it’s showing red on the LED.)

Would buying a $25 replacement laser counter be likely to fix the issue?


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