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How to reprogramme scantronic 9427?

Security system has defaulted to manufactures setting after powercut. My security code is not working. Could anyone talk me through in very basic language and steps how I reset it so that my original alarm code will work again.
Thanks
Sarah Hayes, April 2012
after changing battery my alarm code do not work any more so could you help me to reset it

davidking, August 2016
dont forget to remove mains power frompanel before you open it

gts, April 2012
then buy your self a new battery for the panel

gts, April 2012
key in 07890 key in 21 enter,key in your code,key in 99 enter,

gts, April 2012
link Click here to see other fixes for Scantronic 9427.