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How do I turn my alarm off when it keeps going off and displays BF?

My alarm shows BF in the keypad display and the alarm keeps going off. How do I turn system off 9800+ model
Kandy1964, December 2011
they just out to get you mate :-)

gts, December 2011
It's like being a stuck record isn't it?

acorn, December 2011
bf=battery faulty replace the battery in control panel

gts, December 2011
link Click here to see other fixes for 9800.