- Model: AirGradient ONE (I-9PSL-DE)
- Firmware Version: 3.4.1
- Integration: Official AirGradient Integration in Home Assistant
- Serial Number: 84fce60a40f8
Problem Description
After setting up a Home Assistant automation that changed the LED bar brightness to 0% at night and 70% in the morning, the LED behavior has changed permanently:
Original behavior (working correctly):
(as shown in Support > More About Monitors LEDs)
Current behavior (broken):
- Below 1000 ppm: No LEDs light up at all (not even green)
- From 1001 ppm: First LED lights up orange
- From 1200 ppm: Two LEDs light up
- CO₂ values are displayed correctly on the screen
What I’ve Already Tried
- Modified Home Assistant automation to never set brightness below 1% (instead of 0%)
- Verified LED bar mode is set to “co2” in Home Assistant configuration
- Restarted the sensor multiple times
- Factory reset via configuration button (held 8-10 seconds) - displayed “successfully” on screen
- LED bar test via Home Assistant - all LEDs cycled through correctly
- CO₂ sensor calibration via Home Assistant (after airing out the room)
None of these steps restored the original LED behavior.
How can I restore the original LED behavior so that green LEDs appear below 1000 ppm (as shown in Support > More About Monitors LEDs)?
Is this a known issue with firmware 3.4.1? Are there any hidden configuration parameters or API endpoints to reset the LED thresholds?
Thank you for any assistance!