GV4 Series control panels with firmware version 1.00.011 do not activate B308 outputs for Bell Test. The To resolve this issue, do one of the following:
• For Alarm Bells, use an on-board relay or a ZONEX relay instead of a B308 output.
• Update the control panel to v2.03.018 or higher. Read and understand the operational changes prior to updating. Refer to Important pre-upgrade information in the Release Notes for firmware version to which you update. Find the Release Notes and firmware at us.boschsecutiy.com).