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How can I fix sensor on front door?

My husband cut electricity power off to replace a light bulb and when he put power back on the sensor on door doesn't beep and I don't know when someone coming in
S.mccallum, September 2015
and thank you for the reply,s.

gts, September 2015
Thanks Nick and gts for your prompt replies we have ordered a new battery and the panel is a veritas R8 plus installed in 1991

S.mccallum, September 2015
what panel ?name please

gts, September 2015