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How can I fix?

Got a 9427 style electric ran out and since then alarm won't work.Main box has power but light isn't coming on.Keypad isn't fully lighting up & outside box is on and flashing
James, January 2013
remove mains power from unit and replace the battery

gts, January 2013
There is a SEARCH box at the top of the page to the right.

Use it, rather than ask the same question for the 10000000th time.

Bored, January 2013
link Click here to see other fixes for Honeywell 9427.