UI9xx, UI3x9 – firmware bug fixed

Room units with CO2 sensors show an unusual bug in firmware versions 208 to 212: If the Modbus address is dividable by 5 (such as 5, 10, 15, 20, etc.), the CO2 sensor returns a constant value of 0 ppm. The bug is fixed in firmware versions 214 and 215:

UI9xx
- FW v214 for ELT sensor, PCB version D1051_V13
- FW v215 for SenseAir sensor, PCB version D1051_V15

UI3x9
- FW v215 for SenseAir sensor, PCB versionD1176_V11

The problem can be avoided just by readdressing of the sensor, if circumstances allow. Of course we will be happy to update the firmware free of charge. If you need this, just send the units back to Domat please. We are sorry for any inconvenience caused. All currently shipped units already contain the new firmware.