This announcement means no message from the detector arrived to the cloud for a period over 9 hours.
This condition can be caused by the detector's malfunction, loss of connection between the detector and
AP (increase of signal attenuation for WiFi signal, AP power supply malfunction of interruption)
or interruption of AP connection to the Internet.
HI Limit - Symbol for “upper limit is exceeded” - TEMP HI state
LO Limit - Symbol for “lower limit is exceeded” – TEMP LO state