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one of the alrm units on the outside won't stop going?

My alarm seams to be working fine other than one of the outside boxes is omitting a low volume but constant whirring sound, even when I silence the alarm.
How can I stop it Please ?
Hilda Richardson, September 2008
sounds like a faulty bell ,you could open up the bell box and cut the cable to the sounder, or replace the full bell box,sorry

brad, September 2008