Another example as to why you check every device; what sound does not belong?

We discovered malfunctioning devices throughout this project during an annual inspection. This situation existed from 2008-2021; we fixed most of this after our inspection. The customer opted to hold off for a new TI to fix the mismatched device circuits; Brand-Mixed.
The malfunctions were mainly due to non adherence to the basic rule of not-mixing unlike brands on the same circuit. Gentex and System Sensor devices don't play well together when on the same circuit or mixed across the same power supply. OOPS!