alarms systems run of the mains supply with a standy battery for back up,if the system is not serviced,you can get a dead cell in the battery and that means if you get a power cut then then bell box s.a.b will go into alarm as it see,s it as an attack on the system,the control panel sends a electronic hand shake to the bell box,as long as it recieves the 12volts back,it will not sound the bell or siren,batteries have a life expectancy of five years,so if your system is older then replace the battery with same type that was fitted by your alarm company,hope this is of help.charles maguire,G T S
CHARLES MAGUIRE
August 2010
howtomendit.com for free repair help, information and advice.
