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April 1, 2019 at 7:09 pm
#6500
uRADMonitorKeymaster
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.
Drop me an email on support@uradmonitor.com if you want me to service it.