Had same problem with Intellisense SECURIT 800L and followed your instructions, disconnecting mains first and thankfully everything back to normal. Thank you to bjb.
JSR38
April 2013
Take off the front, tape down the tamper switch spring to stop the noise, disconnect the battery and turn off at the mains, reconnect battery and this will be reset the panel we have have 6 power cuts and i have had to do this every time so have now fitted a switch to the battery lead this work as well.
bjb
May 2010
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