There are a few different methods that can be used to stop trouble beeps on the Simon XT security system.
Press the Status button so that the system can inform you of the troubled condition. If it is an easy solution like changing a battery on a sensor then once the battery is changed, the beeping will stop.
Press Status and then Disarm immediately after. If the troubled condition that the system announces is an issue you do not know how to resolve then this method will stop all beeping for 4 hours. Next, you should call your security provider's tech support line so that they can help get the problem resolved. If the problem is not resolved within 4 hours, the beeping will return and you would have to use this method again to restart the 4 hour time period.
Call your security company's tech support and they can walk you through the process of turning off the trouble beeps permanently until a service technician is able to come fix the issue.