Horn will not sound or red light appear on guard x

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Replacing the battery on the 2670 should not cause the unit stop working. Make sure the spring that provides tension on the plastic finger is not bent out. The spring should be at a 90 degrees...
See PCB replacement instructions below. The horn is part of the board and can only be replaced by replacing the entire board.
Followings are the reason for 98/99 exit alarm ALK not sound when push bar is activated. Make sure key switch on exit alarm ALK is turned on, wait for 20 seconds before you activating the pushba...
Exit devices are not designed for exterior application. If used in an exterior applications then a powder coated finish on the 33/35 and 98/99 series are recommended for exterior applications. ...
The Von Duprin 2670 Guard X does not have a spring loaded latch bolt, it is a dead bolt and will not operate with any electric strikes.
Von Duprin does not offer any lever trim or pulls that through bolt to the Guard X device.  Ives has the 8102-6 and 8105-6 pulls that can be lined up with the mounting screws of the exit device b...
The Von Duprin Guard-X exit device is not fire rated because the deadbolt is not spring loaded. Therefore, there would be no positive latching as required on a fire rated opening. 
The Von Duprin 2670 Guard X is used only on non fire rated doors thus is not fire rated.