I recently powered up my PA-II after being down for a while and I’m only seeing three blue flashes. It is registered and showing on my map but does not appear to be transmitting.
Ideas?
The blue blinking light is for the SD card logger. This means that the SD card is not detected. More information can be found here: SD Card Logging and Troubleshooting.
In this case, we recommend checking if the PurpleAir-**** network is available. If it is, the device is no longer configured to the WiFi. You can follow the steps in the following article to configure your device: Sensor Start-up Guide.