Well it was – but now the grape harvest (vintage) is in full swing and now I have excess formaldehyde, and tonight the worst VOC AQI on the network at 440.
I get to see bursts of CO2 when wine tanks are opened too.
Lots of interesting things – and I just thought my neighbours made noise and smell! https://uradmonitor.com/tools/dashboard-04/?open=820000F4
Sadly, this is most likely a formaldehyde sensor failure. Your unit variant uses analogue connection to sensors, so there is little we can investigate here. Newer A3’s communicate with the formaldehyde sensor via a serial connection.