ID #1213 Does the battery temperature sensor absolutely have to be connected to the GM/A 8.1? Carolina Bachenheimer-Schaefer 06.10.2016 10:58 0 Comments Yes! It is always absolutely necessary to connect the temperature sensor due to the input circuit. Otherwise it could occur that the GM/A 8.1 constantly reboots the system on bus voltage recovery. Tags: KNX, Security